State v. Matthews

State of Maryland v. Kirk Matthews, No. 15, September Term, 2021. Opinion by Biran, J.

EXPERT WITNESSES – ADMISSIBILITY OF EXPERT TESTIMONY –
MARYLAND RULES 5-702 AND 5-403 – REVIEW FOR ABUSE OF DISCRETION
The Court of Appeals held that the trial court did not abuse its discretion by admitting
testimony of the State’s photogrammetry expert witness. At the hearing on the defendant’s
motion to exclude the expert testimony, the expert opined that a person shown carrying a
shotgun in an image captured by a video camera was approximately 5’8” plus or minus
two-thirds of an inch. The expert acknowledged that she was unable to calculate the effect
of certain variables on the degree of uncertainty of the height measurement. The Court held
that the unknown degree of uncertainty with respect to the expert’s conclusions went to the
weight of her testimony, not its admissibility. The expert’s methodology was reliable and
there was no analytical gap in her testimony. The trial court acted within its broad discretion
in concluding that, despite the unknown degree of uncertainty in the height measurement,
the expert’s testimony would assist the jury in understanding the evidence or in deciding a
fact in issue in the case. Therefore, the expert testimony was admissible under Maryland
Rule 5-702.

The Court also affirmed the trial court’s ruling with respect to Maryland Rule 5-403,
concluding that the probative value of the expert testimony was not outweighed by the
danger of unfair prejudice, confusion of the issues, or misleading the jury.
Circuit Court for Anne Arundel County
Case No. C-02-CR-17-002275
Argued: November 1, 2021
IN THE COURT OF APPEALS

OF MARYLAND

No. 15

September Term, 2021

STATE OF MARYLAND

v.

KIRK MATTHEWS

*Getty, C.J.
*McDonald
Watts
Hotten
Booth
Biran
Wilner, Alan M.
(Senior Judge, Specially Assigned),
JJ.

Opinion by Biran, J.
Watts, J., dissents.

Filed: June 22, 2022
*Getty, C.J., and McDonald, J., now Senior
Judges, participated in the hearing and
Pursuant to Maryland Uniform Electronic Legal
Materials Act
(§§ 10-1601 et seq. of the State Government Article) this document is authentic.
conference of this case while active members of
2022-06-22
this Court; after being recalled pursuant to
13:38-04:00 Maryland Constitution, Article IV, Section 3A,
they also participated in the decision and
Suzanne C. Johnson, Clerk
adoption of this opinion.
 In Rochkind v. Stevenson, 471 Md. 1 (2020), this Court adopted the analysis set forth

in Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993), concerning the

admissibility of expert testimony. Our decision in Rochkind generated substantial comment

from the Maryland bar.1 It was unclear to some commentators how trial courts would

interpret Rochkind and how, if at all, Rochkind would change the dynamics of litigation in

Maryland.2 The case presently before us provides the first opportunity for us to address,

post-Rochkind, whether a trial court erred in deciding the admissibility of expert testimony.

Kirk Matthews, the Respondent here, was convicted in the Circuit Court for Anne

Arundel County of murder and related charges in connection with the shooting deaths of

Linda McKenzie and Leslie Smith in the early morning on June 1, 2017. Evidence collected

at the crime scene indicated that the shooter used a 12-gauge shotgun to kill McKenzie and

Smith. Video footage obtained from a nearby home security camera showed a person

carrying a shotgun a few minutes after the shootings. The suspect’s face was indiscernible

in the video.

Prior to Matthews being charged in the killings, the investigating police officers

attempted to determine the height of the person shown in the video footage. To that end,

1
See, e.g., Derek Stikeleather, It’s Official: Maryland Accepts Daubert as
Controlling Law for Admitting Expert Testimony, Maryland Appellate Blog (Aug. 31,
2020), available at https://perma.cc/A342-NSSL; William Sinclair, Weird Science:
Maryland’s New Test for the Admissibility of Expert Testimony, Maryland Business
Litigation Lawyer Blog (Oct. 1, 2020), available at https://perma.cc/49A5-N9Z4.
2
See, e.g., Ronald V. Miller, Jr., Maryland Dumps Frye-Reed for Daubert:
Rochkind v. Stevenson, Maryland Injury Lawyer Blog (Sept. 16, 2020), available at
https://perma.cc/MA76-L6LB (posing the question whether the adoption of Daubert in
Maryland is a “big deal”).
they enlisted the assistance of the Federal Bureau of Investigation (“FBI”). Using a

technique known as “reverse projection photogrammetry,” FBI scientists determined that

the person shown carrying the shotgun was approximately 5’8” tall, plus or minus two-

thirds of an inch. However, the FBI scientists noted in the report detailing their analysis

and findings that, due to several variables, “the degree of uncertainty in this measurement

could be significantly greater.”

Police measured Matthews’s height as approximately 5’9”. Prior to Matthews’s

trial, his attorneys moved to preclude the State from introducing expert testimony from the

FBI scientists who had conducted the reverse projection photogrammetry analysis. The

defense argued that, given the unknown degree of uncertainty that applied to the FBI’s

height measurement, the jury should not be permitted to hear expert testimony concerning

the FBI’s analysis. After holding a hearing on the defense’s motion, the trial court denied

the motion, ruling that the State would be permitted to introduce the challenged expert

testimony.

One of the FBI scientists testified at Matthews’s trial, consistent with her report,

that the subject shown in the video was approximately 5’8” plus or minus two-thirds of an

inch. The expert stated that she could not scientifically quantify several variables that might

lead to a higher degree of uncertainty than plus or minus two-thirds of an inch. However,

she explained why she nevertheless believed that her height measurement was reasonably

accurate. Defense counsel cross-examined the expert at length about the variables that

could lead to the higher degree of uncertainty. The jury found Matthews guilty of two

counts of second-degree murder and several related charges. Matthews appealed.

2
 The Court of Special Appeals reversed Matthews’s conviction, holding that the trial

court erred in admitting the expert testimony. The intermediate appellate court reasoned

that the inability of the expert witness to provide a margin of error that accounted for

several potential variables rendered the height measurement unreliable and therefore

inadmissible under Maryland Rule 5-702 and Rochkind. The State petitioned this Court for

further review.

As we explain more fully below, after Rochkind (as it was before Rochkind) it is the

rare case in which a Maryland trial court’s exercise of discretion to admit or deny expert

testimony will be overturned. This is not one of those cases. Accordingly, we will reverse

the judgment of the Court of Special Appeals and direct that Matthews’s convictions be

reinstated.

I

Background

A. The Double Homicide

Early on June 1, 2017, police responded to the area of Scott Town Road in Shady

Side, Maryland, based on a 911 call involving the sighting of a man armed with a shotgun

and gunshots having been fired. The officers eventually discovered the bodies of Linda

McKenzie and Leslie Smith in a dirt clearing off Scott Town Road. The cause of death for

each victim was multiple shotgun wounds to the upper extremities, at close range. Trails

of blood leading from the road to the location of McKenzie’s and Smith’s bodies indicated

that they had been shot on Scott Town Road and then dragged into the clearing. Ballistics

3
evidence indicated that the shooter used a 12-gauge shotgun, but the murder weapon was

never recovered.

McKenzie and Smith were romantic partners, but McKenzie was angry at Smith on

the evening of May 31, 2017. McKenzie and Smith separately drove to Scott Town Road

that night. After Smith arrived at the dead-end area at the west end of Scott Town Road,

McKenzie chased Smith back up Scott Town Road in a pickup truck, with Smith driving a

white Saturn sedan in reverse. Shortly after the two vehicles passed the intersection of Scott

Town Road and Nick Road, the car Smith was driving backed into a ditch and came to a

stop on Scott Town Road near the intersection of Shady Side Road. That occurred at 11:08

p.m. At approximately 11:57 p.m., police arrived on the scene. The car was removed from

the ditch, and at 12:08 a.m. on June 1, Smith pushed the car down Scott Town Road along

with a man named Joseph Tongue; they placed the car in the driveway of the home that

belonged to Tongue’s grandmother on Scott Town Road just west of the intersection of

Nick Road. The police then left the scene.3

After the car was removed, Smith and McKenzie remained in the vicinity of Scott

Town Road. Smith and McKenzie were shot in quick succession on a stretch of Scott Town

3
Neither Smith, McKenzie, nor Tongue was in possession of a valid driver’s license
when police arrived on the scene. For that reason, the officers did not allow any of them to
operate the Saturn after it was removed from the ditch. Thus, Smith and Tongue pushed
the car down Scott Town Road to Tongue’s grandmother’s house, with someone (possibly
McKenzie) at the wheel, steering.

4
Road that lies to the west of Nick Road shortly before 12:39 a.m. At trial, no witness

testified to having seen the shootings.4

B. The Video Footage of the Suspect

Having received a 911 call that included a report of shots being fired, police officers

returned to Scott Town Road at approximately 12:43 a.m.; they subsequently discovered

the bodies of McKenzie and Smith in a clearing off Scott Town Road to the west of Nick

Road. Later in the morning on June 1, officers obtained video footage from two security

cameras affixed to the home located at 1291 Scott Town Road, a short distance from where

the shootings occurred. While those cameras did not record the shootings, they did capture

relevant events before and after the shootings. Before the shootings, the video footage

showed McKenzie chasing Smith in their respective vehicles. Shortly after the shootings,

the cameras captured several people quickly walking west on Scott Town Road, away from

the scene of the crime, as well as a car backing down Scott Town Road, also away from

the crime scene. A few minutes later, one of the cameras recorded an individual cutting

across the front yard of 1291 Scott Town Road. The individual shown in that footage

carried what appeared to be a shotgun. The suspect’s facial features and race were

completely indiscernible, due to the video being captured at night and the significant

distance between the camera and the suspect. However, it was clear that the suspect was

wearing a cap or some other kind of head covering.

4
However, as discussed below, multiple witnesses who were near the scene of the
crime provided evidence, some of it conflicting, about what they saw and heard before and
after the murders. Several of these witnesses had taken drugs or consumed a substantial
amount of alcohol in the hours leading up to the killings.

5
 C. The FBI’s Analysis of the Video Footage

The Anne Arundel County Police Department (“AAPD”) sought to determine the

height of the person pictured in the video carrying a shotgun. On June 23, 2017, a request

to determine the height of the individual was submitted to the Forensic Audio, Video and

Image Analysis Unit of the FBI’s Digital Evidence Laboratory.

According to a December 5, 2017 report written by Kimberly A. Meline, a forensic

scientist in that unit, the FBI received a DVD containing four videos and 13 still images.

Meline wrote that “[t]he video files were processed for images best depicting the subject,”

and “[o]ne image depicting the questioned individual was selected for photogrammetric

analysis.” Meline reported that, after conducting a reverse projection photogrammetry

analysis on site at 1291 Scott Town Road on November 28, 2017, “[t]he vertical distance

from the ground to the top of the headwear of the questioned individual was determined to

be approximately 5’8”, +/- .67”.” The report then provided a qualification: “However, due

to the subject to camera distance, the resolution of the imagery, the unevenness of the

landscape, and the body position of the subject, the degree of uncertainty in this

measurement could be significantly greater.”

D. The Pretrial Motion to Exclude Expert Testimony

In the meantime, on September 29, 2017, a grand jury returned an indictment in the

Circuit Court for Anne Arundel County charging Matthews with murder and related

offenses.

On August 3, 2018, Matthews filed a pretrial motion to exclude expert testimony

regarding the FBI’s photogrammetric analysis. Matthews contended that exclusion of such

6
expert testimony was warranted, among other grounds, under Maryland Rules 5-7025 and

5-4036 and under the Frye-Reed7 standard for admissibility of expert testimony. The State

filed a response asserting that photogrammetry is a generally accepted methodology and

that “concerns about the validity of the experts [sic] conclusions … should be presented to

the jury through cross examination regarding the margin of error, environmental factors

5
Maryland Rule 5-702 provides:

Expert testimony may be admitted, in the form of an opinion or otherwise, if
the court determines that the testimony will assist the trier of fact to
understand the evidence or to determine a fact in issue. In making that
determination, the court shall determine

(1) whether the witness is qualified as an expert by knowledge, skill,
experience, training, or education,
(2) the appropriateness of the expert testimony on the particular
subject, and
(3) whether a sufficient factual basis exists to support the expert
testimony.
6
Maryland Rule 5-403 provides: “Although relevant, evidence may be excluded if
its probative value is substantially outweighed by the danger of unfair prejudice, confusion
of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or
needless presentation of cumulative evidence.”
7
The Frye-Reed standard for admissibility of expert testimony applied in Maryland
courts at the time of Matthews’s trial. “Frye” came from Frye v. United States, 293 F. 1013,
1014 (D.C. Cir. 1923), in which the D.C. Circuit announced a then-new evidentiary
standard by which the admissibility of expert testimony involving a scientific principle or
discovery turned on the “general acceptance” of such evidence “in the particular field in
which it belongs.” “Reed” came from Reed v. State, 283 Md. 374 (1978), in which this
Court adopted the Frye standard for use in Maryland courts. After Reed, the rule in
Maryland for the next 42 years was that, “before a scientific opinion will be received as
evidence at trial, the basis of that opinion must be shown to be generally accepted as
reliable within the expert’s particular scientific field.” Id. at 381. We decided Rochkind v.
Stevenson, 471 Md. 1 (2020), abrogating the Frye-Reed standard, while Matthews’s appeal
was pending in the Court of Special Appeals.

7
and degree of uncertainty in the measurement, as well as presentation of contrary expert

testimony.”

On September 21, 2018, the trial court held an evidentiary hearing on Matthews’s

motion to preclude the expert testimony. While Matthews did not dispute that

photogrammetry was a generally accepted methodology, he challenged its application in

his case. The State called Meline as a witness at the hearing. She was accepted as an expert

in “photogrammetry and reverse projection photogrammetry.” Meline explained that

“[p]hotogrammetry is just a very long word that means we’re trying to make measurements

in photos.” She further testified that there are two basic forms of photogrammetry: (1)

reverse projection photogrammetry, which requires going to the place where the questioned

image was created and “duplicating the imaging conditions that captured the original scene

in order to make a measurement”; and (2) analytical photogrammetry, which relies on

software to make measurements based on the image itself, and does not require going to

the scene. According to Meline, software-based photogrammetry is less accurate than

reverse projection photogrammetry.

Meline testified that she analyzed the home surveillance video taken on the night of

the homicides, which depicted a walking individual, to determine “which specific frame of

the video would be most conducive for photogrammetric analysis” for height. Meline was

able to identify “one image that would be within a reasonable margin of error in order to

complete photogrammetric analysis.” That image became what Meline referred to as the

“questioned image.” Meline then described how she and a colleague went to 1291 Scott

8
Town Road on November 28, 2017, and conducted the reverse projection photogrammetry

analysis.

First, Meline located and identified the camera that had captured the questioned

image. Using that same camera to conduct the reverse projection photogrammetry analysis

allowed Meline to “mimic any lens distortion that’s inherent to the image.” She then

examined live footage “to ensure alignment of stationary items within both the foreground

and the background of the image to make sure that that camera was still in the same

position.” After confirming this alignment, she walked to the location where the suspect

was pictured standing in the questioned image, placed a height chart at that spot, and then

“completed overlays of [her]self in position as well as the subject in the image … to make

sure that [they] were standing in the same location.”

Meline explained that she then created an “overlay” of the questioned image and the

height chart to measure the height of the individual in the image. To indicate the height,

she superimposed a yellow arrow “at the top of the headwear of the questioned individual

and where it aligns on the height chart that was placed in the position the subject was

standing.” The height thus indicated was 5’8.”

Meline also took measurements to estimate “the uncertainty or the error” associated

with her height estimate based on the resolution of the questioned image and the positional

accuracy of the height chart. She explained that the image resolution affects how much the

estimated height changes for every pixel by which her placement of the yellow arrow was

mistaken, and here, one pixel represented 0.53 inches. She further explained that

quantifying “positional accuracy” involves using planar geometry to calculate how much

9
the height would change, assuming a standard three-inch error in the placement of the

height chart, and here, based on the distance from the camera to the ground (110”) and the

distance of the subject from the camera (62’), a three-inch error in the placement of the

height chart would alter the height by 0.133 inches. Based on those two calculations,

Meline determined that the margin of error of her height measurement was plus or minus

two-thirds of an inch. Thus, Meline opined that the suspect’s height, as measured from the

ground to the top of their headwear, was 5’8” plus or minus two-thirds of an inch.

Meline also captured images of herself beside the height chart at the scene to provide

an additional known height value. She explained that

[t]he purpose of doing that is essentially as a double check of my
measurement. And so when I’m standing in the location of the individual you
can see that I’m attempting to mimic the position of both the feet as well as
essentially how the person is standing so that I can double check the
measurement that I calculate against my own known height and determine
whether it appears to be reasonable based on those factors.

When asked what Meline was “able to determine in terms of … the subject’s height

in comparison to [Meline’s] height,” Meline stated that “[t]he subject’s height appeared to

be slightly shorter than my own height based on overlay of myself in that same scene

against the questioned image.” Meline testified that, “depending on which footwear [she

is] wearing,” her height is “between five-nine and a half and five-ten.”

Meline opined that her estimate of the height of the subject was within a reasonable

degree of scientific certainty. Meline further testified that she was never told Matthews’s

height.

10
 On cross-examination, defense counsel asked Meline about the qualifying statement

in her report that “the degree of uncertainty in this measurement could be significantly

greater” based on several variables, including “the subject to camera distance, the

resolution of the imagery, the unevenness of the landscape, and the body position of the

subject.” Meline testified: “I don’t have a scientific way of quantifying how those

dimensions had an effect on my measurement and consequently I wanted in an abundance

of caution to mention them.”8

Defense counsel asked Meline, “you’re familiar with the 2009 report on forensics

from the National Research Council” which “discussed a need for any scientific report to

include clear characterizations on the limits of the analysis that was done; is that accurate?”

Meline replied: “Certainly,” which is “why I included the calculable uncertainty as well as

the incalculable uncertainty.” The following exchange then occurred:

[Defense Counsel]: Okay, which means ultimately we don’t know how
uncertain this result is?

[Meline]: I would say that I have some indication based on the
overlay of my own, myself in that similar position with
the image of the questioned individual and knowing that
the questioned individual appeared to be slightly shorter
than I, myself, am that I have some indication as to the

8
Defense counsel also asked Meline about an email that Meline’s assistant, Jenna
Walker, sent to an FBI special agent in September 2017, when authorities were considering
whether to go forward with a reverse photogrammetric analysis to ascertain the suspect’s
height. In the email, Walker stated that, based on the “subject to camera distance, resolution
and adequate lighting to view the subject head-to-toe in an upright position,” as well as
other factors, “[w]e have estimated that … you are looking at [an error rate] range of +/-
close to 3”.” Meline noted in her testimony at the motions hearing that Walker provided
this plus-or-minus three-inch figure before the reverse photogrammetric analysis was
conducted and, therefore, it was “not based on any specific measurements done at the
scene” and was “no more than an estimate.”

11
 uncertainty with the method. However, there are factors
in here that I cannot calculate.

….

[Defense Counsel]: [A]s here where the conditions are far from pristine,
[the] margin of error is going to become greater it stands
to reason, right?

[Meline]: It does.

Upon further questioning concerning the scientifically unquantifiable variables,

Meline explained why – despite those variables – she considered her height measurement

to be accurate within a reasonable degree of scientific certainty. She stated that “the body

position of the individual is the factor that [she was] most concerned about,” which is why

she is “so careful when it comes to image selection and trying to … use an image that

depicts the individual from head to toe in as upright of a position as possible.” In response

to defense counsel’s question, “would you agree that how someone wears a head covering

even if you knew what it was could impact the reported height of an individual?”, Meline

stated, “I would, which is why when I report a measurement I report that measurement as

a measured distance from the ground to the top of the headwear of the individual.” Defense

counsel also asked, “Can you tell us exactly how you located where the bottom of the foot

would be for that individual?” Meline replied, “[W]e indicated where the back of the heel

was and then essentially worked from there on the left foot.”

Matthews called two witnesses in support of his motion, including Robert

Sanderson, who was accepted as an expert in photogrammetry. Sanderson disagreed with

Meline’s opinion that the suspect’s height could be reliably estimated as 5’8” +/- .67”. With

12
respect to the body position of the subject, Sanderson did not seriously quarrel with

Meline’s contention that the questioned image captured the subject in a position that was

conducive to photogrammetric analysis, referring to the questioned image as “a correctly

selected frame.” However, according to Sanderson, other factors made the questioned

image unsuitable for analysis. These included “whether or not you could see things in it,

most notably the feet and the top of the headwear. The unevenness of the landscape which

is a strong issue here, because when you don’t have the footwear and you can’t see where

whatever footwear the person had on contacted the ground because of vegetation or

unevenness, you have a variable there that is not really quantifiable.”9

The State recalled Meline as a rebuttal witness. With respect to foot placement,

Meline testified:

So what I did was I actually start by placing myself right on the height chart.
And we saw that in the video that we showed earlier this morning. So
essentially what I do is I align my leg and my foot with what I can see in the
video in order to show that the foot where all the weight of the individual
was balanced is in the proper location.

And then I actually do the same to the best of my ability with the right leg
where you can see that the right leg was slightly forward as Mr. Sanderson
testified, so that you could see the knee of the right leg. I make sure that both
of those legs match up, and then based on the stature that I have … I place
the height chart to within the center of gravity of the individual, again to
make sure that it’s going to the best of my ability through the top of their
head so that I can make an accurate measurement.

9
Matthews’s other witness at the hearing was a private investigator who described
the area of Scott Town Road as “swampy” and the terrain of 1291 Scott Town Road as
“uneven.”

13
 The prosecutor then asked: “[I]n talking about foot placement and terrain, what’s

the best way for you to see how the ground would affect that measurement?” Meline

replied: “To go to the scene.”

On cross-examination, Meline stated that, “with the exception of the possibility of

changes in the terrain between June and November, I would say that my ability to stand

where the individual was standing tells me what the terrain was like.” Defense counsel

followed up: “So you wouldn’t be aware of what kind of minor changes in terrain there

might have been within that time?” Meline responded, “No, ma’am.”

Defense counsel asked Meline if “at the end of the day this is not an opinion that is

offered with a reasonable degree of scientific certainty with respect to the 0.67-inch degree

of uncertainty?” Meline replied: “The 0.67 as well as the five-foot-eight were both offered

with a reasonable degree of scientific certainty. However, I mentioned that the 0.67 does

not incorporate all areas of potential uncertainty.” Meline acknowledged that she could not

quantify the overall margin of error based on the variables that were not calculable.

On redirect examination, the prosecutor and Meline had the following exchange:

[Prosecutor]: You cannot scientifically say a quantification, but you testified
earlier that that means you cannot plug it into a mathematic
formula, correct?

[Meline]: That’s correct.

[Prosecutor]: So you are able to say that you visually can indicate that your
height was taller, slightly taller than the individual in the video;
is that correct?

[Meline]: That is correct.

14
 After hearing counsel’s subsequent arguments, the trial court denied Matthews’s

motion to exclude Meline’s testimony. Addressing the defense’s argument under Maryland

Rule 5-403, the court stated that the “potential height of the individual in question is of

value, and the information is probative.” The court continued:

So the question in my mind is whether or not [the probative value] is
outweighed by the danger of unfair prejudice, confusion of the issues, or
misleading the jury…. [A]ll evidence is prejudicial, … [t]he question is
whether or not it is … [u]nfairly prejudicial.

[The evidence] does have … certainly a qualifier as [defense counsel]
correctly points out. But it is right there, available to the jury, available for
cross-examination, there is a conclusion that is reached. It is clear. It is
concise. It is not confusing. It was not particularly confusing to the Court to
see it. When you look at the photos, and you look at the overlay, and you
look at all the images, it – it’s something that is clear to your eye, and then is
explained by an expert, and there are mathematical calculations, but in
addition to that, as to the – the second sentence, if you will, of the opinion
regarding the potential of uncertainty, that is clear as well, and it is
particularly stated, and it is available to the Defense for cross-examination,
and, quite candidly, I find it very easy to understand.

… I do not find it unfairly [prejudicial]. I do not find that it confuses the
issues, and nor do I find that it would be misleading to the finder of fact[.]

Thus, the trial court declined to exclude Meline’s testimony under Rule 5-403.

With respect to Rule 5-702, the trial court found that Meline was qualified as an

expert based on knowledge, skill, experience, training, or education in the relevant area.

The court further found that Meline’s testimony about the use of reverse-photogrammetric

analysis to calculate the height of the individual captured in the surveillance video was

appropriate in Matthews’s case. Finally, the court found that “based on all of the

information presented, … there is a sufficient factual basis for her to testify, to support her

testimony, as to the opinion that she indicated that she would express.” Thus, the trial court

15
denied Matthews’s motion and ruled that the State would be permitted to introduce

Meline’s expert testimony concerning reverse projection photogrammetry and her height

measurement of the person shown in the questioned image. The prosecutor confirmed with

the trial court that Meline would be permitted to “say that visually I am 5’10”, I was on the

video, and the person visually … was shorter than she was, in that position.”

E. The Trial

Matthews’s jury trial began on October 16, 2018. In her opening statement, the

prosecutor explained that locals call Scott Town Road the “Lane.” They refer to the dead-

end section of the Lane (at its western end point) as “Down Bottom” and the section closer

to the intersection with Nick Road as “Up Top.” The police know the intersection of Scott

Town Road and Nick Road to be an “open-air drug market.” Indeed, earlier in the day on

May 31, 2017, police had installed a pole camera near that intersection as part of an effort

to investigate illegal drug sales.

The State introduced footage recorded by the pole camera between 11:00 p.m. on

May 31 and 2:00 a.m. on June 1, which captured events occurring in the section of Scott

Town Road immediately to the east of Nick Road. The State also introduced video footage

from that same three-hour period that was taken from the cameras located at 1291 Scott

Town Road, including the footage of the suspect cutting through the front yard of the

property at approximately 12:43 a.m. while carrying what appeared to be a shotgun. The

murders occurred in the area between the pole camera and 1291 Scott Town Road, and

were not captured on any of the cameras.

16
 The State called several witnesses who were blood relations or long-time friends or

acquaintances of Matthews. Some of these witnesses testified that they consumed drugs

and/or alcohol on the night of May 31 and into the early morning of June 1. Several were

uncooperative on the witness stand and were effectively impeached by defense counsel.

Still, they provided testimony that was damaging to Matthews.

For example, Richard Jackson, who had known Matthews for “20 years or so,”

testified that after Smith’s car backed into the ditch, he saw McKenzie and Smith arguing

before police arrived. According to Richard Jackson, at that time Matthews “was trying to

have them, you know, quiet down because they were being super loud.” Smith was

“running his mouth,” and Matthews said, “that’s all right, I got something for your ass or

something along those lines.” Matthews then walked away. After the car was removed

from the ditch and the police left the scene, Richard Jackson saw Matthews “walking down

the road with a shotgun.” At that time, Matthews was on Nick Road approaching Scott

Town Road, where McKenzie and Smith were. While Richard Jackson was on the stand,

the State showed him the video footage taken from one of the cameras at 1291 Scott Town

Road and, in particular, the footage of the man carrying what appeared to be a shotgun.

Richard Jackson testified that the person shown in that footage looked like Matthews. 10

10
On cross-examination, Richard Jackson admitted to being a drug addict and to
buying (and most likely using) crack cocaine on the night of May 31. He also confirmed
that, prior to trial, while he told the detectives about hearing Matthews say, “I’ve got
something for you,” he only mentioned seeing Matthews with a shotgun earlier in the
evening (approximately 40 minutes prior to the car going into the ditch).

17
 Joseph Tongue – the person who helped Smith push the Saturn down Scott Town

Road – testified that he is Matthews’s cousin. According to Tongue, after the car went into

the ditch, Tongue heard McKenzie and Smith “screaming,” “fussing,” and “arguing.”

Tongue told them that they needed to get their car out of the ditch before police arrived,

but “the police showed up.” After the car was removed from the ditch and had been pushed

down the road, McKenzie and Smith continued to argue in front of Tongue’s

grandmother’s house. Tongue saw Matthews coming, and knew that Matthews “was mad.”

Tongue told McKenzie and Smith to leave. As Matthews, McKenzie, and Smith were

arguing, Tongue “started walking off” and then “heard a gunshot” followed by “another

gunshot.” When he looked back, he saw “Kirk [Matthews] and Linda and them,” and

Matthews was holding what “[l]ooked like a gun,” “a large gun.”

The prosecutor asked, “[W]hen’s the first time you saw him with a shotgun?”

Tongue replied, “When he was coming around the corner.” The prosecutor asked, “[D]id

you see anybody other than Kirk Matthews with a gun?” Tongue replied, “Nah.” The

prosecutor asked what, if anything, Tongue heard Smith say to Matthews. Tongue replied,

“You not going to shoot nobody.”11

Charles Jackson testified that he has known Matthews for about 10 years. He stated

that he lives less than a mile from the Lane and went there to buy drugs. On May 31, 2017,

Charles Jackson arrived at the Lane around 10:30 or 11:00 p.m., and was “Down Bottom”

11
On cross-examination, Tongue stated that he consumed alcohol and drugs on the
night of the killings, including PCP, Xanax, and a pint of vodka. He testified that he had
smoked PCP every day for ten years.

18
with several others – including Matthews – when McKenzie came “speeding down there,

cussing about looking for her car.” According to Charles Jackson, Matthews told

McKenzie: “You’re making the lane hot. Take that shit up out of here.” Charles Jackson

was also present when Smith arrived and subsequently backed the car into the ditch. After

watching the video footage taken in front of 1291 Scott Town Road, Charles Jackson

testified that the person shown carrying a gun “looks like” Matthews.

Rico Hicks testified that Matthews is a “good friend of the family.” Rico Hicks also

testified that he was on the Lane on the night of the shooting and “heard gunshots,”

however, he never saw anyone with a gun and never saw who was shot. Rico Hicks’s

testimony was impeached through the testimony of Edward Hicks – his relative12 – who

testified that in the days following the shooting, Rico Hicks “told me that he seen Kirk

[Matthews] shoot the – two people and then just dragged them off the road” and that “it

was the worst thing he ever saw.”

Crime Scene Technician Katie Ladue testified that four shotgun shells were

recovered at the scene of the crime and “it did appear that [the victims] had been dragged

out of the road because there was blood that trailed from an original location where there

was blood pooling off to the location of the dirt area where they were found.” The State

introduced crime scene photographs showing the blood trails leading from the middle of

Scott Town Road to the victims’ bodies in the nearby dirt clearing.

12
Rico Hicks testified that Edward Hicks is his “uncle,” while Edward Hicks
testified that Rico Hicks is his “cousin.”

19
 On October 23, 2018, the fifth day of the State’s case-in-chief, the State called

Steven Marchant as a witness. Marchant was a crime scene technician for AAPD in June

2017. Marchant testified that, on June 3, 2017, he executed a search warrant to obtain,

among other things, Matthews’s height. According to Marchant, he “used the tape measure

that we have in the van, and I ran it straight up behind the subject and then took a

photograph of it.” The State introduced a copy of that photograph, which reflected that

Matthews’s height was measured to be approximately 5’9”. Later on October 23, 2018,

AAPD Detective Jason DiPietro testified that he witnessed Marchant measure Matthews’s

height, that “the tape was to the ground,” and that Matthews was measured at

approximately 5’9” in height.

The State then called Meline as an expert witness in the areas of photogrammetry

and reverse projection photogrammetry. Meline testified in keeping with her testimony at

the motions hearing regarding the reverse-projection photogrammetry analysis that she

performed on site at 1291 Scott Town Road. Meline opined, to a reasonable degree of

scientific certainty, that the person shown in the video footage carrying what appeared to

be a shotgun was 5’8” plus or minus two-thirds of an inch. Meline also explained on direct

examination that several other factors, including the unevenness of the ground and the

distance of the camera from the subject, could add to the degree of uncertainty in a way

she could not calculate. Defense counsel cross-examined Meline at length concerning these

variables and other points. Among other things, Meline acknowledged that she could not

tell what kind of head covering the subject was wearing or if the subject was wearing it

high on the head or pulled down tight to the scalp. In addition, Meline conceded that she

20
could not determine what kind of shoes the person was wearing and if they contained a

heel of any height. However, Meline took issue with defense counsel’s suggestion that it

was difficult to see the subject’s feet; according to Meline, “[W]e believe that we could see

one foot very firmly of the individual.” And, while she again acknowledged that there were

“additional considerations that may have affected uncertainty that can’t be calculated,”

Meline maintained that she “still was comfortable with” her opinion that the subject’s

height was 5’8” plus or minus two-thirds of an inch.

After the State rested its case, the defense called several witnesses,13 including

Katherine Bragg. Bragg testified that she moved to Shady Side with her husband and

children in November 2016. She and her family lived at 5218 Nick Road. Bragg testified

that, on the evening of May 31, 2017, she sat outside her house and drank four or five

White Russian cocktails while she waited for her husband to return home from work. At

one point, she heard what sounded like a car getting stuck. Subsequently, she saw a white

woman wearing “short, short shorts” walk past her house approaching Scott Town Road.14

Soon afterwards, Bragg saw a white man wearing a gray t-shirt come from the same

direction as the white woman.15 After the man passed Bragg’s house, Bragg heard arguing

between male and female voices. Approximately 10 minutes after that, Bragg saw a second

13
Although the defense had called Robert Sanderson as an expert witness in
photogrammetry at the hearing on Matthews’s pretrial motion, the defense did not call
Sanderson at trial.
14
McKenzie was wearing “short shorts” on the night of May 31-June 1, 2017.
15
Smith wore a dark gray t-shirt that night.

21
white man wearing a gray sweatshirt and jeans walk past her house in the same direction

that the two prior white individuals (presumably McKenzie and Smith) had proceeded.

According to Bragg, this second white man was “thin,” “younger,” and “tall” (at least

5’11”) with blonde hair. Bragg testified that this man was carrying a shotgun, and that he

“cocked” the shotgun in front of her driveway. Bragg’s husband then called 911 to report

an armed man. While Bragg’s husband was making the 911 call, Bragg and her husband

heard gunshots, which Bragg’s husband then reported to the 911 operator. It was this 911

call that led police to return to the area of Scott Town Road at approximately 12:43 a.m.

Bragg’s testimony was important to the defense because not only is Matthews

shorter than the man Bragg described having seen with a shotgun16; Matthews is African

American, whereas Bragg described seeing a white man with blonde hair carry and “cock”

a shotgun in front of her house. In addition, at 56 years old in June 2017 and 240 pounds

(according to his driver’s license issued in July 2016), Matthews is not someone most

people would describe as “younger” or “thin.”

After the defense rested, the trial court instructed the jury17 and the parties presented

closing arguments. With respect to Meline’s testimony, defense counsel stated:

16
As stated above, AAPD personnel measured Matthews at approximately 5’9” on
June 3, 2017. Matthews’s driver’s license lists him at 5’6”. The record does not reflect
whether Matthews was wearing shoes at the time AAPD measured his height and, if so,
the heel size of his shoes.
17
Pertinent here, the trial court instructed the jurors, among other things, that “[y]ou
should consider an expert’s testimony together with all the other evidence,” and “[y]ou
should give expert testimony the weight and value you believe it should have. You are not
required to accept an expert’s testimony even if it is uncontradicted. As with any other
witness, you may believe all, part or none of the testimony of an expert.”

22
 I’m not going to say a lot about it because I think it’s very simple. Not what
[Meline] does, I think she’s smart. I think she does it well. I think it’s a great
tool. But at the end of the day what she is telling you is nothing.

….

That’s her expert opinion, but however – however, due to the … distance,
the resolution of the imagery, the quality, the unevenness of the landscape,
which you’ll see pictures of – it’s ditches and bumpy and grassy – the body
position because no one’s a hundred percent sure what that is, the degree of
uncertainty – that two-thirds one way or the other – could be significantly
greater and that’s not a quantifiable number. Well, an inch, five inches?

So what does that tell you? He might be five-eight based on what I know, but
there’s a lot of stuff I don’t know which could significantly change that. So
what it’s telling you is nothing….

As smart as Ms. Meline is, and she certainly is, she didn’t add anything. So
why is she here? To bolster a case that has no physical or forensic evidence.
To make it look like what, “We did this and she’s from the FBI and she’s
really smart.” And she’s going to say all these things and it sounds important,
but at the end of the day it’s telling you nothing forensically.

On October 26, 2018, the jury found Matthews guilty of two counts of second-

degree murder, two counts of use of a firearm in the commission of a crime of violence,

and related charges. The trial court subsequently sentenced Matthews to an aggregate

sentence of 110 years of imprisonment, with all but 80 years suspended. Matthews

appealed his convictions.

F. Appeal

The Court of Special Appeals reversed Matthews’s convictions and remanded for a

new trial, holding that the trial court abused its discretion by admitting Meline’s expert

testimony. Matthews v. State, 249 Md. App. 509 (2021). In so holding, the intermediate

23
appellate court concluded that there was an “analytical gap” between the underlying data

and the opinion:

Ms. Meline concluded that the person in the video was 5’8” with a
“calculable uncertainty” of 0.67 inches, which would seem to eliminate a
taller white man as the shooter. But without shrinking from her estimate, she
undermined her calculation by acknowledging that there was no scientific
way to calculate the actual uncertainty, and that the margin of error could be
significantly greater due to the “far from pristine” circumstances of this
case…. [She] admitted that she was unable to see the individual’s feet, that
the individual was wearing a head covering, and that there was “concern”
about the subject not being at “full height” in the video she was measuring.

Under these circumstances, the missing input variables that had not been
considered in the seemingly precise height calculation prevented a reliably
accurate height calculation. Put another way, the analytical gap between the
data available for reverse photogrammetry projections and the conclusion
Ms. Meline offered to the jury remained unbridged. Although Mr. Matthews
was able to challenge [Meline’s] conclusions by cross-examining her about
the missing pieces, it should not have fallen to the jury to work through the
science on its own.

Id. at 543-44. Having ruled in Matthews’s favor under Maryland Rule 5-702, the Court of

Special Appeals did not need to consider his alternative argument under Rule 5-403.

However, the Court stated that “the unreliability of the height estimate resulting from this

expert testimony raises serious doubt about whether the probativity of allowing it in

outweighed the danger of unfair prejudice, especially where the video itself was

unilluminating and the remaining testimony so equivocal.” Id. at 544.

The State filed a petition for certiorari in this Court, seeking review of the following

question: “Did the Court of Special Appeals err by holding that an expert witness created

an ‘analytical gap,’ and thus rendered her testimony inadmissible as a matter of law, by

24
acknowledging the limitations of her scientific methodology?” On June 22, 2021, we

granted the State’s petition. State v. Matthews, 474 Md. 719 (2021).18

II

Standard of Review

Appellate courts review a trial court’s decision concerning the admissibility of

expert testimony under Maryland Rule 5-702 for abuse of discretion. See Rochkind, 471

Md. at 10. Under this standard, an appellate court does “not reverse simply because the …

court would not have made the same ruling.” Devincentz v. State, 460 Md. 518, 550 (2018)

(internal quotation marks and citation omitted). “Rather, the trial court’s decision must be

well removed from any center mark imagined by the reviewing court and beyond the fringe

of what that court deems minimally acceptable.” Id. (internal quotation marks and citation

omitted); see also Williams v. State, 457 Md. 551, 563 (2018) (“An abuse of discretion

occurs where no reasonable person would take the view adopted by the circuit court.”);

Jenkins v. State, 375 Md. 284, 295-96 (2003) (“Abuse occurs when a trial judge exercises

discretion in an arbitrary or capricious manner or when he or she acts beyond the letter or

reason of the law.”).

We also review a trial court’s ruling concerning admissibility of evidence under

Maryland Rule 5-403 for abuse of discretion. Montague v. State, 471 Md. 657, 673-74

(2020).

18
In its opinion, the Court of Special Appeals rejected two arguments Matthews had
raised regarding other evidentiary issues. Matthews did not cross-petition this Court to
review those portions of the Court of Special Appeals opinion, and as such, they are not
before us.

25
 III

Discussion

In the pre-Rochkind era, this Court frequently observed that “the admissibility of

expert testimony is a matter largely within the discretion of the trial court, and its action in

admitting or excluding such testimony will seldom constitute a ground for reversal.” Roy

v. Dackman, 445 Md. 23, 38-39 (2015) (quoting Bryant v. State, 393 Md. 196, 203 (2006)

(internal quotation marks omitted)); see also Clemons v. State, 392 Md. 339, 359 (2006);

Oken v. State, 327 Md. 628, 659 (1992); Hartless v. State, 327 Md. 558, 576 (1992);

Johnson v. State, 303 Md. 487, 515 (1985); Stebbing v. State, 299 Md. 331, 350 (1984). In

Rochkind, even as we abrogated the Frye-Reed standard in favor of Daubert, we reiterated

that a trial court’s ruling to admit or to exclude expert witness testimony “will seldom

constitute a ground for reversal.” Rochkind, 471 Md. at 10 (quoting Roy v. Dackman, 445

Md. at 38-39). We reaffirm today that, in this respect, Rochkind did not change the law in

Maryland. Post-Rochkind, it is still the rare case in which a Maryland trial court’s exercise

of discretion to admit or deny expert testimony will be overturned. As we explain below,

the trial court in this case did not abuse its broad discretion in admitting Meline’s expert

testimony.

26
 A. The Trial Court’s Ruling Under Maryland Rule 5-702

We begin our analysis of the trial court’s exercise of discretion under Maryland Rule

5-702 by reviewing the governing law. To set the stage, we discuss the evolution of federal

law concerning the admissibility of expert testimony involving scientific matters.

1. The Supreme Court’s Daubert Trilogy19

For 70 years prior to the Supreme Court’s decision in Daubert in 1993, the Frye

“general acceptance” test was the dominant standard that courts used to determine the

admissibility of novel scientific evidence. As noted above, this Court adopted the Frye test

as the law in Maryland in Reed v. State in 1978.

In Daubert, the Supreme Court stated that Federal Rule of Evidence 702 superseded

the Frye test. At the time, Federal Rule 702 provided: “If scientific, technical, or other

specialized knowledge will assist the trier of fact to understand the evidence or to determine

a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or

education, may testify thereto in the form of an opinion or otherwise.” In Daubert, the

Court explained that the inquiry into admissibility of evidence under Rule 702 is “a flexible

one,” and its focus “must be solely on principles and methodology, not on the conclusions

that they generate.” Daubert, 509 U.S. at 594-95. To that end, the Court interpreted Rule

702 to require a determination whether the scientific testimony at issue is “not only

relevant, but reliable.” Id. at 589. With respect to this reliability assessment, the Court

19
See Rochkind, 471 Md. at 14 n.5 (noting that courts have referred to Daubert v.
Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993), General Electric Co. v. Joiner,
522 U.S. 136 (1997), and Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999), as the
“Daubert Trilogy”).

27
provided a non-exclusive list of factors for federal trial courts to consider: (1) “whether a

theory or technique ... can be (and has been) tested”; (2) “whether [it] has been subjected

to peer review and publication”; (3) “the known or potential rate of error”; (4) “the

existence and maintenance of standards controlling the technique’s operation”; and

(5) incorporating the Frye test, whether the theory or technique is “general[ly] accepted”

within the relevant scientific community. Id. at 593-94. The Daubert analysis, according

to the Court, was more flexible than the “uncompromising ‘general acceptance’ test,” id.

at 596, and gave trial courts “greater discretion to admit scientific expert testimony that is

relevant and founded on sound principles, even though novel or controversial.” Rochkind,

471 Md. at 14.

In 1997, in General Electric Co. v. Joiner, 522 U.S. 136 (1997), the Supreme Court

first articulated the concept of an “analytical gap” in considering the admissibility of expert

testimony. Joiner was an electrician who developed small-cell lung cancer. Id. at 139.

During his employment, he had been exposed to polychlorinated biphenyls (PCBs) and

products derived from PCBs, which were manufactured by the defendants. Id. at 139-40.

The plaintiff’s experts opined during their depositions that PCBs and the derivative

products at issue promote cancer. Id. at 140. They further opined that Joiner’s exposure to

PCBs and their derivatives was likely responsible for Joiner’s cancer. Id. The trial court

precluded the plaintiff’s experts from testifying at trial, concluding that they had not

established a link between exposure to PCBs and small-cell lung cancer. Id. The Supreme

Court upheld the trial court’s exercise of discretion. The Court explained that none of the

epidemiological studies upon which the experts relied provided a causal link between PCBs

28
and lung cancer. Id. at 145-46. The Court stated that “nothing in either Daubert or the

Federal Rules of Evidence requires a district court to admit opinion evidence that is

connected to existing data only by the ipse dixit of the expert. A court may conclude that

there is simply too great an analytical gap between the data and the opinion proffered.” Id.

at 146.

In Kumho Tire Co. v. Carmichael, 526 U.S. 137, 141 (1999), the Supreme Court

extended applicability of the Daubert test to other kinds of non-scientific knowledge,

including to “testimony based on ‘technical’ and ‘other specialized’ knowledge.” The

Court also explained that “whether Daubert’s specific factors are, or are not, reasonable

measures of reliability in a particular case is a matter that the law grants the trial judge

broad latitude to determine.” Id. at 153.

2. Maryland Rule 5-702

This Court adopted Maryland Rule 5-702 in 1994, soon after the Supreme Court

decided Daubert. The Rule provides:

Expert testimony may be admitted, in the form of an opinion or otherwise, if
the court determines that the testimony will assist the trier of fact to
understand the evidence or to determine a fact in issue. In making that
determination, the court shall determine

(1) whether the witness is qualified as an expert by knowledge, skill,
experience, training, or education,
(2) the appropriateness of the expert testimony on the particular
subject, and

29
 (3) whether a sufficient factual basis exists to support the expert
testimony.

Md. Rule 5-702.

Whether the third prong’s requirement of “a sufficient factual basis” has been met

requires analysis of two subfactors: (1) an adequate supply of data; and (2) a reliable

methodology. Rochkind, 471 Md. at 22. Absent either of these factors, an expert opinion is

“mere speculation or conjecture.” Id. (internal quotation marks and citations omitted).

The proponent of challenged expert testimony must establish the three prongs of

Rule 5-702 (including the two subfactors that make up a “sufficient factual basis”) by a

preponderance of the evidence. See Crane v. Dunn, 382 Md. 83, 92 (2004) (explaining that

the trial court generally applies the preponderance of the evidence standard in making

admissibility determinations); see Daubert, 509 U.S. at 592 n.10 (“These matters should

be established by a preponderance of proof.”).

3. The Rochkind Decision

In Rochkind, we abrogated the Frye-Reed general acceptance test and adopted

Daubert. In so doing, we explained that “[a]dopting Daubert eliminates the duplicative

analysis” that courts previously were required to undertake and instead “permits trial courts

to evaluate all expert testimony – scientific or otherwise – under Rule 5-702.” Rochkind,

471 Md. at 35 (emphasis in original). Thus, after Rochkind, Rule 5-702 is the touchstone

when determining the admissibility of expert testimony.

Rochkind held that, in conducting its analysis under Rule 5-702, a trial court should

consider a number of factors in determining whether the proffered expert testimony is

30
sufficiently reliable to be provided to the trier of fact. Several of those factors came from

Daubert itself:

(1) whether a theory or technique can be (and has been) tested;
(2) whether a theory or technique has been subjected to peer review
and publication;
(3) whether a particular scientific technique has a known or potential
rate of error;
(4) the existence and maintenance of standards and controls; and
(5) whether a theory or technique is generally accepted.

Id. (quoting Daubert, 509 U.S. at 593-94; Fed. R. Evid. 702 Advisory Committee Note).

We also favorably cited additional factors that other courts had applied in

determining whether expert testimony is sufficiently reliable. These factors include:

(6) whether experts are proposing to testify about matters growing
naturally and directly out of research they have conducted
independent of the litigation, or whether they have developed their
opinions expressly for purposes of testifying;
(7) whether the expert has unjustifiably extrapolated from an accepted
premise to an unfounded conclusion;
(8) whether the expert has adequately accounted for obvious
alternative explanations;
(9) whether the expert is being as careful as he [or she] would be in
his [or her] regular professional work outside his [or her] paid
litigation consulting; and
(10) whether the field of expertise claimed by the expert is known to
reach reliable results for the type of opinion the expert would give.

Id. at 35-36 (quoting Fed. R. Evid. 702 Advisory Committee Note).

Having provided this non-exclusive list of factors for trial courts to consider as part

of the reliability analysis inherent in Rule 5-702, we added several overarching

observations. First, we noted that the reliability inquiry is “a flexible one.” Id. at 36

(quoting Daubert, 509 U.S. at 594). Second, the trial court must focus “solely on principles

and methodology, not on the conclusions that they generate.” Id. (quoting Daubert, 509

31
U.S. at 595) (internal quotation marks omitted). However, “conclusions and methodology

are not entirely distinct from one another.” Id. (quoting Joiner, 522 U.S. at 146) (internal

quotation marks omitted). Thus, “[a] trial court … must consider the relationship between

the methodology applied and conclusion reached.” Id. Third, a trial court need not “admit

opinion evidence that is connected to existing data only by the ipse dixit of the expert”;

rather, “[a] court may conclude that there is simply too great an analytical gap between the

data and the opinion proffered.” Id. (quoting Joiner, 522 U.S. at 146) (internal quotation

marks omitted).20 Fourth, “all of the Daubert factors are relevant to determining the

reliability of expert testimony, yet no single factor is dispositive in the analysis. A trial

court may apply some, all, or none of the factors depending on the particular expert

testimony at issue.” Id. at 37. Finally, Rochkind did “not upend [the] trial court’s

gatekeeping function. ‘Vigorous cross-examination, presentation of contrary evidence, and

20
Even before we decided Rochkind, this Court had recognized and applied the
concept of an “analytical gap” that the Supreme Court discussed in Joiner. See Rochkind,
471 Md. at 17. In Blackwell v. Wyeth, we stated that generally accepted methodology “must
be coupled with generally accepted analysis in order to avoid the pitfalls of an ‘analytical
gap.’” Blackwell v. Wyeth, 408 Md. 575, 608 (2009). We subsequently discussed the
“analytical gap” concept in Chesson v. Montgomery Mut. Ins. Company, stating that
although “[g]eneral acceptance does not equate to unanimity of opinion within a scientific
community ... [a] trial judge … cannot admit expert testimony based on scientific
methodology without consideration of whether the analysis itself is flawed and posits an
‘analytical gap.’” Chesson v. Montgomery Mut. Ins. Co., 434 Md. 346, 356-57 (2013)
(quoting Blackwell, 408 Md. at 608). In Savage v. State, we held that the expert witness at
issue in that case did not “connect the dots” between the empirical observations and his
ultimate conclusions, and concluded that the existence of an analytical gap undermined the
validity of the expert witness’s testimony. Savage v. State, 455 Md. 138, 158, 170-71
(2017) (discussing how the expert’s “analysis did not bridge the ‘analytical gap’ between
the data available to him and his ultimate conclusions”).

32
careful instruction on the burden of proof are the traditional and appropriate means of

attacking shaky but admissible evidence.’” Id. at 38 (quoting Daubert, 509 U.S. at 596).

Against this backdrop, we now consider whether the trial court abused its discretion

under Maryland Rule 5-702 in admitting Meline’s expert testimony. As part of that

analysis, we assess the trial court’s reliability determination under Rochkind.21

4. The Trial Court Did Not Abuse Its Discretion Under Rule 5-702.

The State argues that the Court of Special Appeals erred in concluding that the trial

court abused its discretion when it admitted Meline’s expert testimony. According to the

State, the Court of Special Appeals misapplied the concept of an “analytical gap.” In the

State’s view, there was no logical disconnect between the underlying photogrammetry data

and Meline’s height estimate. According to the State, while Meline’s inability to quantify

how certain variables affected the degree of uncertainty may have detracted from the

ultimate weight of her height estimate, it did not render her opinion inadmissible. The State

further contends that the Court of Special Appeals failed to afford the appropriate level of

deference to the trial court’s threshold admissibility ruling. According to the State, based

on the evidence presented at the pretrial hearing, the trial court was well within the bounds

of its discretion in finding that Meline had an adequate supply of data and applied a reliable

21
In Rochkind, we stated that our decision would “appl[y] to this case and any other
cases that are pending on direct appeal when this opinion is filed, where the relevant
question has been preserved for appellate review.” 471 Md. at 38-39. We explained that
“[i]n this context, the ‘relevant question’ is whether a trial court erred in admitting or
excluding expert testimony under Maryland Rule 5-702 or Frye-Reed.” Id. at 39. As noted
above, Matthews’s trial occurred before we decided Rochkind. Because Matthews objected
to the admission of Meline’s testimony under Rule 5-702 and Frye-Reed, Rochkind applies
here.

33
methodology. Thus, Meline’s estimate of the vertical distance, as measured from the

ground to the top of the suspect’s headwear, was more than “mere speculation or

conjecture.”

Matthews argues that the Court of Special Appeals correctly held that Meline’s

proffered testimony presented an analytical gap, and that the trial court should not have

admitted it. According to Matthews, Meline’s opinion was unreliable due to the unknown

margin of error. That is, because Meline could not inform the jury of the overall degree of

uncertainty of her height estimate, the jury was not able to make an intelligent decision

about how much weight to ascribe to the evidence, and the trial court therefore should not

have allowed the jury to hear Meline’s testimony.

We agree with the State that the trial court did not abuse its discretion. There is no

dispute that Meline’s methodology was reliable. Nor was there any analytical gap in her

proffered testimony. The unknown degree of uncertainty concerning the accuracy of

Meline’s height estimate went to the weight the jury should give to the expert testimony,

not to its admissibility.22

a. The Expert Testimony Was Not Per Se Inadmissible Due to Meline’s Inability
to Scientifically Calculate the Effect of All Potential Variables on the Degree
of Uncertainty.

Matthews contends that Meline’s opinion was unreliable due to Meline’s inability

to provide an overall margin of error for her height estimate, given that she could not

22
The State alternatively argues that, if the trial court erred in admitting Meline’s
expert testimony, the error was harmless beyond a reasonable doubt. Because we conclude
that there was no error in the admission of Meline’s testimony, we do not reach the State’s
harmless error argument.

34
scientifically calculate the effect of several variables. Other than the error rate, Matthews

points to no other Daubert/Rochkind factor in support of his contention that Meline’s

testimony lacked sufficient reliability. To the extent Matthews argues that an unknown

degree of uncertainty renders an expert opinion per se inadmissible, he is incorrect.

The reliability factors we listed in Rochkind – including “whether a particular

scientific technique has a known or potential rate of error” – are neither exhaustive nor

mandatory. See Kumho Tire, 526 U.S. at 153 (“[W]hether Daubert’s specific factors are,

or are not, reasonable measures of reliability in a particular case is a matter that the law

grants the trial judge broad latitude to determine.”); Savage v. State, 455 Md. 138, 178

(Adkins, J., concurring) (explaining that “a trial court is not required to consider any or all

of the Daubert factors in making its reliability determination”; those factors “were ‘meant

to be helpful, not determinative’”) (quoting Kumho Tire, 526 U.S. at 151).

Thus, it is not sufficient to point to an unknown degree of uncertainty/error rate that

applies to an expert opinion and claim that a trial court is necessarily stripped of discretion

to admit that opinion. Rather, as discussed below, the trial court should first consider

whether the unknown degree of uncertainty inheres in the expert’s methodology or whether

the uncertainty applies to the expert’s conclusions. If the latter scenario is applicable, the

trial court should determine whether the uncertainty in the expert’s conclusions is the

product of an analytical gap in the expert’s analysis and/or whether the uncertainty

ultimately renders the opinion unhelpful to the trier of fact.

35
 b. Because Meline’s Methodology Was Reliable, the Trial Court Was Not
Required to Exclude Her Testimony Due to the Unknown Degree of
Uncertainty That Applied to the Height Measurement.

There is no dispute in this case concerning the reliability of Meline’s methodology.

Matthews does not contend that photogrammetry – and, in particular, reverse projection

photogrammetry – is an unreliable technique. Indeed, photogrammetry has been an

accepted technique for making measurements in photographs for many years and has been

deemed reliable by many courts applying the Daubert factors. See, e.g., Chapman ex. rel.

Estate of Chapman v. Bernard’s Inc., 167 F. Supp. 2d 406, 421 (D. Mass. 2001) (“The

application of mathematics to photographs to derive measurements appears reasonable and

does not strike this Court as ‘junk science.’”); Commonwealth v. Caruso, 4 N.E.3d 1283,

1289 (Mass. App. 2014) (“According to the FBI affidavit, photogrammetry has been in use

for over a century[.]”); Gecker as Trustee for Collins v. Menard, Inc., 2019 WL 3778071,

at *4 (N.D. Ill. Aug. 12, 2019) (noting that photogrammetry “has a long, recognized history

of reliability in the scientific and judicial community,” and collecting cases). Rather than

challenging Meline’s methodology, Matthews argues that Meline’s conclusions were

unreliable because she could not account for the effect of several variables on the degree

of uncertainty that applied to her height measurement.

Matthews fails to appreciate the distinction between uncertainty inherent in an

expert’s methodology and uncertainty that applies to an expert’s conclusions following the

application of a reliable methodology. If an unacceptably high margin of error exists

whenever a particular scientific technique is applied or no error rate can ever be determined

with respect to that technique, a trial court may well decide to exclude testimony

36
concerning the application of such a technique. In that situation, the court is concerned

about the inherent unreliability of the expert’s methodology, i.e., the unacceptably high

risk of an inaccurate conclusion being reached in every case where the technique is used.

A different situation applies where an expert applies a reliable technique to an adequate

supply of data, but in reporting her results, states that she is unable to quantify a specific

degree of uncertainty/margin of error. That scenario is generally less problematic than

where an expert has applied a technique that is unreliable in every instance in which it is

used.

For these reasons, in exercising its gatekeeping function under Rule 5-702, a trial

court generally should be most concerned about the reliability of an expert’s methodology.

Once a trial court is satisfied that an expert has applied a reliable methodology to an

adequate supply of data, the court should not exclude the expert’s testimony merely

because the court is concerned that the expert’s particular conclusions may be inaccurate.

See Manpower, Inc. v. Ins. Co. of Pennsylvania, 732 F.3d 796, 806 (7th Cir. 2013) (“The

district court usurps the role of the jury, and therefore abuses its discretion, if it unduly

scrutinizes the quality of the expert’s data and conclusions rather than the reliability of the

methodology the expert employed.”); Ruiz-Troche v. Pepsi Cola of Puerto Rico Bottling

Co., 161 F.3d 77, 85 (1st Cir. 1998) (“Daubert does not require that a party who proffers

expert testimony carry the burden of proving to the judge that the expert’s assessment of

the situation is correct.”). Rather, the trial court should only exclude expert testimony if it

finds that it amounts to “mere speculation or conjecture.” Rochkind, 471 Md. at 22 (internal

quotation marks and citations omitted).

37
 Matthews’s reliance on cases such as Polymer Dynamics, Inc. v. Bayer Corp., 2005

WL 1041197 (E.D. Pa. 2005), therefore, is misplaced. In Polymer Dynamics, the federal

district court granted the defendant’s pretrial motion to exclude one of the plaintiff’s

experts. See id. at *3. The court found that the expert’s methodology was unreliable for

several reasons, including the small sample sizes of the experiments the expert conducted

and “an unacceptable margin of error” (25 percent for one experiment and approximately

55 percent for another experiment). Id.; see also Cassidy v. State, 235 N.J. 482, 498 (2018)

(where improper calibration of blood-alcohol testing device resulted in unknown

uncertainty of measurements taken by the device, test results produced by that device were

inadmissible under Frye); United States v. Cordoba, 194 F.3d 1053, 1059-60 (9th Cir.

1999) (testimony regarding results of polygraph held to be inadmissible due to unreliability

of the technique, as reflected in, among other things, the lack of a known error rate for

polygraphs generally).

In this case, unlike Polymer Dynamics, Cassidy, and Cordoba, Meline used a

reliable methodology. And the trial court could conclude, based on Meline’s testimony,

that Meline applied her reliable technique to an adequate supply of data. Thus, the trial

court did not necessarily abuse its discretion by failing to exclude Meline’s testimony after

Meline acknowledged that her reliable methodology did not produce a result for which the

overall margin of error could be quantified. However, we emphasize that just because the

trial court was not required to exclude Meline’s testimony when Meline acknowledged an

unknown degree of uncertainty, it does not follow that the trial court was required to admit

it. In such a situation, before admitting expert testimony, a trial court should consider

38
whether the unknown degree of uncertainty is the result of an analytical gap and, if there

is no such analytical gap, the court should determine whether the opinion would assist the

jury in understanding the evidence and/or deciding a fact in issue, despite the unknown

degree of uncertainty.

c. There Was No Analytical Gap in Meline’s Proffered Testimony.

An “analytical gap” typically occurs as a result of “the failure by the expert witness

to bridge the gap between his or her opinion and the empirical foundation on which the

opinion was derived.” Savage, 455 Md. at 163. For example, in Savage, a criminal case

involving a claim of self-defense, we perceived an analytical gap where the defense expert

failed to “connect the dots” between the results of the psychological tests he had

administered on the defendant and his opinion that the defendant was more likely to have

greater difficulty controlling his reactions under conditions of chaos and stress. Id. at 164.

Here, there was no analytical gap in Meline’s proffered testimony. At the motions

hearing, Meline explained in detail how she conducted the reverse photogrammetry

analysis to arrive at her height estimate of 5’8” and how she calculated the known

uncertainty of plus or minus two-thirds of an inch. She then explained that there were other

variables that might lead to a significantly higher degree of uncertainty, and that she could

not scientifically calculate them.

There was no disconnect between the results of the photogrammetry analysis and

Meline’s opinion. The underlying height value was based on the calibrated height chart in

the overlay image, and the 0.67 inch margin of error was based on calculations that went

essentially unchallenged. To this extent, Meline’s height estimate was the result of

39
combining “generally accepted methodology” with “generally accepted analysis.” See

Rochkind, 471 Md. at 17.

The Court of Special Appeals viewed Meline’s acknowledgment that there were

other variables she could not quantify that could increase the margin of error as indicative

of an analytical gap in her analysis. 249 Md. App. at 543-44. We fail to perceive an

analytical gap in the absence of a demonstrable flaw in Meline’s logic. Meline testified at

the motions hearing that, based on the reverse projection photogrammetric analysis she

conducted, she concluded that the height of the subject in the questioned image was 5’8”

plus or minus two-thirds of an inch, but the plus-or-minus value could be greater based on

other variables she could not quantify. There was nothing illogical about that explanation.

Whether or not Meline’s opinion would assist the jury in understanding the evidence or

deciding a fact in issue, despite the unknown degree of uncertainty, is another question that

the trial court needed to consider. We now turn to that question.

d. The Trial Court Acted Within Its Discretion in Concluding That Meline’s
Opinion Would Assist the Jury to Understand the Evidence or to Determine
a Fact in Issue.

The trial court ruled that Meline’s expert testimony was admissible under Maryland

Rule 5-702. In so doing, the court necessarily found that the testimony would “assist the

trier of fact to understand the evidence or to determine a fact in issue.” Md. Rule 5-702.

This was the case despite Meline’s acknowledgment that the known margin of error of two-

thirds of an inch could be significantly greater due to certain scientifically unquantifiable

variables. The trial court acted within its discretion in making this finding.

40
 First, Meline explained in detail how she conducted her analysis, which allowed the

trial court to assess the rigor and care with which Meline approached her work. The trial

court could conclude that Meline ensured, among other things, that: (1) the surveillance

camera was in the same position as when the questioned image was captured; (2) she stood

in the same spot in the front yard of 1291 Scott Town Road where the suspect had stood

when the questioned image was captured; (3) she placed the height chart in the same spot

where the subject had been standing; (4) the height chart was placed “within the center of

gravity of the individual”; (5) she appropriately used software to overlay the image

depicting the suspect and the image of the height chart to ensure that the height chart was

in the same location, so that the suspect’s height could be measured; and (6) she accurately

calculated the known degree of uncertainty.

Second, Meline explained at the motions hearing why, despite the unknown degree

of uncertainty attributable to certain variables, she nevertheless was comfortable with her

height estimate of 5’8” plus or minus two-thirds of an inch. She stated that “the body

position of the individual is the factor that [she was] most concerned about,” which is why

she is “so careful when it comes to image selection and trying to … use an image that

depicts the individual from head to toe in as upright of a position as possible.” Notably, the

defense expert agreed that the questioned image was a “correctly selected image.” In

response to defense counsel’s question, “[W]ould you agree that how someone wears a

head covering even if you knew what it was could impact the reported height of an

individual?”, Meline stated, “I would, which is why when I report a measurement I report

that measurement as a measured distance from the ground to the top of the headwear of the

41
individual.” Defense counsel also asked, “Can you tell us exactly how you located where

the bottom of the foot would be for that individual?” Meline replied, “[W]e indicated where

the back of the heel was and then essentially worked from there on the left foot.” Meline

further stated that her “ability to stand where the individual was standing tells me what the

terrain was in that location,” although she acknowledged that she would not be aware of

“minor changes” in the terrain between June and November. The trial court was entitled to

credit Meline’s assessment that she had sufficiently addressed the impact of these variables

on her height estimate, despite the fact that she could not quantify them.

Third, given Meline’s known height of between 5’9” and a half and 5’10”, and the

fact that she ensured that she stood in the same spot and position as the subject in the

questioned image, Meline was able to opine that the subject appeared to be slightly shorter

than Meline herself. Given that 5’8” plus or minus two-thirds of an inch is, in fact, “slightly

shorter” than Meline’s height, the trial court reasonably could conclude that the unevenness

of the terrain and the other unquantifiable variables – to the extent Meline could not

completely eliminate them from having any impact – had little to no effect on her height

estimate.

All of these factors allowed the trial court to reasonably conclude that the height

estimate of the subject as 5’8” plus or minus two-thirds of an inch would assist the jury in

determining the identity of the person in the questioned image, despite the fact that Meline

could not calculate the effect of all variables on the degree of uncertainty. The trial court’s

finding that Meline’s testimony would assist the jury in understanding the evidence or

deciding a fact in issue was not an endorsement of the accuracy of Meline’s height

42
measurement. Rather, it was a determination that Meline’s testimony had probative value.

The trial court acknowledged Meline’s statement regarding the potential uncertainty of her

assessment, and observed that cross-examination by the defense would be the proper

vehicle to attack the validity of Meline’s height estimate. We agree. But even if one or

more members of this Court would have decided to exclude Meline’s testimony had we

been the trial judge, we certainly cannot say that the trial court’s decision to admit the

challenged testimony was “well removed from any center mark imagined by the reviewing

court and beyond the fringe of what that court deems minimally acceptable.” Devincentz,

460 Md. at 550 (citing North v. North, 102 Md. App. 1, 14 (1994)).

In this regard, we find the reasoning of the federal court in Gecker persuasive. In

that case, an expert testified concerning close-range photogrammetry in a personal injury

case. Gecker, 2019 WL 3778071, at *1. The expert recreated the estimated force of motion

when a woman was hit by a shopping cart train in a grocery store parking lot. Id. At issue

in the case were unquantifiable “error rates” in a fact-specific case. The court stated that:

The fact that Dr. Fisher’s specific application of photogrammetric principles
cannot be evaluated in light of potential error rates is not fatal to the
admissibility of Dr. Fisher’s testimony. As Dr. Fisher explained during his
deposition, error rates in the field of close-range photogrammetry depend on
the quality of the available data, which is fact specific to each case…. Nor is
he the first expert applying photogrammetry to have cited this limitation.
Therefore, if the error rate for photogrammetry depends on the video or photo
quality in each case, it is of no surprise that Dr. Fisher is unable to provide
specific error rates for the interior and exterior Menards surveillance cameras
as they existed in 2014. To the extent Dr. Fisher was able to account for error
rates in his analysis of Plaintiff’s specific case, he did so…. This, again, is
something that goes to credibility but not threshold admissibility of Dr.
Fisher’s opinions.

….

43
 … While the Court is mindful of the fact that reliable methods do not always
produce reliable conclusions, Daubert only requires courts to scrutinize the
former. The latter is a question for the jury. The Court can find an expert
opinion reliable if it is based on “good grounds” or methods and procedures
of science rather than on subjective belief or unsupported speculation.
Daubert, 509 U.S. at 590. Because Dr. Fisher’s theory can be tested, the
science of close-range photogrammetry has been subject to peer review and
is accepted in the relevant scientific community, Dr. Fisher’s methodology
and testimony meet the standard for admissibility under Daubert and Rule
702.

Gecker, 2019 WL 3778071, at *6-*7. See also United States v. Williams, 235 F. App’x

925, 928-29 (3d Cir. 2007) (notwithstanding defendant’s argument that, among other flaws,

the government failed to proffer evidence as to reverse projection photogrammetry’s error

rate, affirming trial court’s admission of expert testimony concerning height estimate of

bank robber); Aviva Sports, Inc. v. Fingerhut Direct Mktg., Inc., 829 F. Supp. 2d 802, 830

(D. Minn. 2011) (denying motion to exclude photogrammetry expert’s testimony; where

the expert “thoroughly detailed his methods, including … his criteria for making

measurements … and reducing errors due to inherent measurement error, poor photograph

quality, parallax (or perspective), and age estimates,” court held that movant’s criticisms

were “issues concerning the factual basis of [the expert’s] calculations and the errors in his

measurements—issues well-suited for vigorous cross-examination and presentation of

contrary evidence”) (cleaned up).

Our conclusion respects the trial court’s role as a “gatekeeper,” and does not

transform the trial court into an “armed guard.” Ruiz-Troche, 161 F.3d at 86. “As long as

an expert’s scientific testimony rests upon ‘good grounds, based on what is known,’ it

should be tested by the adversary process – competing expert testimony and active cross-

44
examination – rather than excluded from jurors’ scrutiny for fear that they will not grasp

its complexities or satisfactorily weigh its inadequacies.” Id. at 85 (quoting Daubert, 509

U.S. at 590).

The trial court did not require “the jury to work through the science on its own.”

Matthews, 249 Md. App. at 544. Indeed, Matthews’s counsel ably cross-examined Meline

at the trial, and highlighted the uncertainty in Meline’s opinion in her closing argument,

contending that Meline’s opinion is “telling you nothing forensically.” In addition,

Matthews could have called Sanderson in his defense case had he decided to offer the jury

a competing expert opinion.

In sum, the trial court did not abuse its broad discretion under Maryland Rule 5-702

in admitting Meline’s testimony.

B. The Trial Court’s Ruling Under Maryland Rule 5-403.

We also conclude that the trial court did not abuse its discretion by declining to

exclude Meline’s testimony under Maryland Rule 5-403.

The trial court found that the proffered testimony had probative value and that its

probative value was not outweighed by the danger of unfair prejudice, confusion of the

issues, or misleading the jury. In particular, the trial court found that Meline’s proffered

testimony

… is clear. It is concise. It is not confusing. It was not particularly confusing
to the Court to see it. When you look at the photos, and you look at the
overlay, and you look at all the images, it – it’s something that is clear to
your eye, and then is explained by an expert, and there are mathematical
calculations, but in addition to that, as to the – the second sentence, if you
will, of the opinion regarding the potential of uncertainty, that is clear as well,

45
 and it is particularly stated, and it is available to the Defense for cross-
examination, and, quite candidly, I find it very easy to understand.

… I do not find it unfairly [prejudicial]. I do not find that it confuses the
issues, and nor do I find that it would be misleading to the finder of fact[.]

Matthews argues that the trial court’s ruling was an abuse of discretion. According

to Matthews, Meline’s testimony “had virtually no probative value. Since the suspect’s

height could not be estimated with any degree of certainty, the evidence did not rule out a

suspect who was 5’11.” And, Matthews argues, whatever minimal probative value it had

was substantially outweighed by the danger of unfair prejudice. In particular, Matthews

contends that “[t]he manner in which [Meline’s] height estimate was presented—a

seemingly precise estimate of height and ‘calculable’ margin of error—is confusing and

misleading. It suggests that the FBI believed the suspect to be within .67 inches of 5’8”,

when in fact, this ‘calculable’ margin of error has no practical significance at all and the

actual margin of error is unknown.”

We disagree with Matthews’s assessment. The trial court easily could conclude that

Meline’s testimony was probative of the issue of the identity of the shooter. Among other

things, Meline testified that the subject in the questioned image was slightly shorter than

Meline herself, who measures between 5’9” and a half and 5’10”. The evidence before the

jury was that Matthews was approximately 5’9”. Meline’s testimony tended to corroborate

the testimony of Joseph Tongue and others who said that they saw Matthews with a shotgun

around the time of the murders. Her testimony also tended to corroborate the State’s

witnesses who testified that the subject in the questioned image looked like Matthews.

46
 We also agree with the trial court’s conclusion that the probative value of Meline’s

testimony was not substantially outweighed by the danger of unfair prejudice. The trial

court explained that it found Meline’s testimony easy to understand. The court

acknowledged the “qualifier” that was part of Meline’s testimony, but decided that any

flaws in Meline’s conclusions attributable to this qualifier were properly the subject of

cross-examination or competing expert testimony. As we said in Rochkind, “[v]igorous

cross-examination, presentation of contrary evidence, and careful instruction on the burden

of proof are the traditional and appropriate means of attacking shaky but admissible

evidence.” 471 Md. at 38 (quoting Daubert, 509 U.S. at 596) (internal quotation marks

omitted). The trial court acted well within its discretion in rejecting Matthews’s argument

under Rule 5-403.

IV

Conclusion

For the reasons stated above, we conclude that the trial court did not abuse its

discretion in admitting expert testimony concerning the reverse projection photogrammetry

analysis that the FBI performed, and the height estimate of the suspect that resulted from

that analysis. Accordingly, we reverse the judgment of the Court of Special Appeals and

order that Matthews’s convictions be reinstated.

JUDGMENT OF THE COURT OF SPECIAL
APPEALS REVERSED; CASE REMANDED
TO THE COURT OF SPECIAL APPEALS
WITH THE INSTRUCTION TO REINSTATE
THE JUDGMENT OF CONVICTION. COSTS
IN THE COURT OF SPECIAL APPEALS AND
THIS COURT TO BE PAID BY PETITIONER.

47
Circuit Court for Anne Arundel County
Case No. C-02-CR-17-002275
Argued: November 1, 2021
IN THE COURT OF APPEALS

OF MARYLAND

No. 15

September Term, 2021
______________________________________

STATE OF MARYLAND

v.

KIRK MATTHEWS
______________________________________

*Getty, C.J.
*McDonald
Watts
Hotten
Booth
Biran
Wilner, Alan M. (Senior Judge,
Specially Assigned),

JJ.
______________________________________

Dissenting Opinion by Watts, J.
______________________________________

Filed: June 22, 2022

*Getty, C.J., and McDonald, J., now Senior
Judges, participated in the hearing and
conference of this case while active members of
this Court. After being recalled pursuant to Md.
Const., Art. IV, § 3A, they also participated in
the decision and adoption of this opinion.
 Respectfully, I dissent. I would hold that the Court of Special Appeals correctly

determined that the Circuit Court for Anne Arundel County abused its discretion in

admitting the testimony of Kimberly Meline, the State’s expert witness, because there was

an analytical gap between the facts and data available to the expert and the opinion that the

expert rendered. Based on a technique known as “photogrammetry and reverse projection

photogrammetry,” the State’s expert rendered an opinion as to the height of a person

depicted in a video image/frame even though there were a number of variables or pieces of

information missing for use in the analysis. At trial, the expert candidly acknowledged that

she had no way of knowing the effect that the missing information had on the outcome of

her estimate. The Court of Special Appeals held that, based on the record, the circuit court

should have precluded the expert from testifying and that the error in allowing the

testimony was not harmless. See Matthews v. State, 249 Md. App. 509, 544, 246 A.3d

644, 664. I agree.

First, this case illustrates some of the problems inherent in this Court’s decision to

apply the holding of Rochkind v. Stevenson, 471 Md. 1, 38, 236 A.3d 630, 651-52

(2020), reconsideration denied (Sept. 25, 2020)—in which the Court adopted the factors

discussed in Daubert v. Merrell Dow Pharms., Inc., 509 U.S. 579, 593 (1993) and

additional factors contained in the Advisory Committee Notes to Federal Rule of Evidence

702—retroactively. In adopting the Daubert factors and additional ones, this Court

emphasized that its holding did not represent a significant change in the law because a drift

toward Daubert had been occurring for many years. See Rochkind, 471 Md. at 17, 236

A.3d at 639. In an effort to assuage concerns about the change that adopting Daubert would
create, this Court engaged in a lengthy analysis to show that for the admission of expert

testimony, an assessment of the Daubert factors was already partially required under

Maryland Rule 5-702 and our case law. See Rochkind, 471 Md. at 26, 236 A.3d at 644-

45. There is no question that our case law on admission of expert testimony concerning

novel scientific issues under the approach adopted in Reed v. State, 283 Md. 374, 382, 391

A.2d 364 (1978) had evolved since 1978, see Savage v. State, 455 Md. 138, 180–81, 166

A.3d 183, 208-09 (2017) (Adkins, J., concurring), but from my perspective the adoption of

the Daubert factors and additional ones constituted a significant change in the standard for

admission of expert testimony in Maryland.

The adoption of the Daubert factors and additional ones involves a new evidentiary

analysis that garners a different standard of review. Before Rochkind, although appellate

courts reviewed application of Maryland Rule 5-702 for abuse of discretion, a circuit

court’s analysis under Frye-Reed warranted a de novo standard of review. See Rochkind,

471 Md. at 37, 236 A.3d at 651. In Rochkind, this Court changed that and held that “all

[expert] testimony is reviewed under an abuse of discretion standard.” Id. at 37, 236 A.3d

at 651 (citing Gen. Elec. Co. v. Joiner, 522 U.S. 136, 143 (1997)). The majority opinion

states that “after Rochkind (as it was before Rochkind) it is the rare case in which a

Maryland trial court’s exercise of discretion to admit or deny expert testimony will be

overturned.” Maj. Slip Op. at 3. So, what can be gleaned from this is that unlike with the

Frye-Reed de novo standard of review, a trial court’s decision to admit or preclude expert

testimony under the Daubert factors and additional ones will rarely be reversed under an

abuse of discretion standard. Whether this prediction will prove to be accurate remains to

-2-
be seen.

In addition, it seems apparent that even though consideration of issues such as

whether an analytical gap existed was already required under Maryland Rule 5-702, the

adoption of the five Daubert factors and five additional ones imposed additional standards

that must be met or, at a minimum, more factors to be considered before expert testimony

may be admitted. Next, it seems fair to consider whether the adoption of the Daubert

factors and other additional factors will create similar results in Maryland as their adoption

has in other jurisdictions. For example, recent scholarship suggests “the Daubert

admissibility standard impacts filings exactly like a method of tort reform, but only for

claimants of color.” Rochkind, 471 Md. at 58, 236 A.3d at 664 n.4 (Watts, J., dissenting

(quoting Andrew W. Jurs & Scott DeVito, A Tale of Two Dauberts: Discriminatory Effects

of Scientific Reliability Screening, 79 Ohio St. L.J. 1107, 1109-10 (2018))).

After assuring that the adoption of Daubert and other additional factors was not a

significant change, the Rochkind opinion made the shift to the Daubert factors and

additional ones apply retroactively to any case that was pending at the time of the issuance

of the opinion “where the relevant question has been preserved for appellate review.”

Rochkind, 471 Md. at 38, 236 A.3d at 652 (quoting Kazadi v. State, 467 Md. 1, 47, 223

A.3d 554, 554 (2020)). In doing so, this Court cited a standard for retroactivity that applies

to changes in constitutional rules in criminal cases. In other words, after announcing the

evolution from Frye-Reed to Daubert and additional factors, the Court made it retroactive

under a standard reserved for changes to constitutional rules in criminal cases. See

Rochkind, 471 Md. at 67 n.6, 236 A.3d at 669 n.6 (Watts, J., dissenting) (observing that

-3-
Griffith v. Kentucky, 479 U.S. 314, 322 (1987), concerned the retroactive application of

constitutional rules in criminal cases).

Now, this Court has before it a case that was tried before the decision in Rochkind.

And, after the Court of Special Appeals permitted additional briefing concerning Rochkind,

Matthews, 249 Md. App. at 542 n.9, 246 A.3d at 663 n.9, the majority opinion reverses the

Court of Special Appeals’s determination under Rochkind (which excluded the expert’s

testimony) to render admissible the testimony of a State’s expert witness in the field of

“photogrammetry and reverse projection photogrammetry analysis” against a defendant in

a criminal case. See Maj. Slip. Op. at 47.

In this case, the expert analyzed home surveillance video that depicted an individual

(who had been identified as a suspect) and selected a particular image/frame of the video

from which to conduct a “reverse photogrammetric analysis” to estimate the individual’s

height. In other words, the expert rendered an opinion as to the height of an individual

depicted in a video using calculations based on an image or frame of the video and other

information she gathered. It was undisputed that the image or frame chosen for the analysis

was captured at night and could not be enhanced, that the person in the video wore a hat

(meaning that the expert could not see the top of the person’s head and the expert did not

know the measurements of the hat), and that the expert could not see both of individual’s

feet (meaning that the expert could not know whether the person was standing at full

height). In addition, the expert acknowledged that there was uncertainty in “the subject to

camera distance, the resolution of the imagery, the unevenness of the landscape, and the

body position of the subject[.]”

-4-
 In my view, the issue of the admissibility of the expert testimony in this case

centered squarely on whether there was an analytical gap between the expert’s opinion and

the data underlying the opinion. With certainty, there was an insufficient factual basis for

the expert’s opinion and an analytical gap existed between the available facts and the

opinion rendered by the expert. The issue of whether there is an analytical gap between an

expert’s opinion and the data underlying it is a component of the analysis of the

admissibility of expert testimony that existed under Maryland Rule 5-702 separate and

apart from this Court’s adoption of Daubert and other additional factors in Rochkind. See

Savage, 455 Md. at 183-84, 166 A.3d at 210 (Adkins J., concurring) (discussing that this

Court considered whether there existed an analytical gap under Maryland Rule 5-702).

From my perspective, that the analysis of expert opinion under Maryland Rule 5-702 for

the existence of an analytical gap predated the adoption of the Daubert factors and

additional ones in Rochkind raises an interesting point about this case. Given that this

Court’s abandonment of Frye-Reed and embrace of Daubert-Rochkind is unnecessary to

the analysis of whether an analytical gap involving the expert’s opinion existed, any

observations about the general applicability of Rochkind would be mostly dicta.

It is well-established that not every Daubert factor and other additional factor

adopted under Rochkind will apply in every case. See Rochkind, 471 Md. at 37, 236 A.3d

at 651. Stated otherwise, it is acknowledged that not all of the Daubert factors fit each

case. In this case, the question of admissibility focused on whether an analytical gap

existed. The notion that Kirk Matthews, Respondent, has not challenged the State’s

expert’s testimony under any Daubert factor or additional factor apart from the error rate

-5-
is simply wrong. See Maj. Slip Op. at 34-35. The question of whether a technique has a

known rate of error or whether its results fall within a certain margin of error is far different

from the question of whether the technique was performed with a lack of relevant

information and therefore the reliability of the results cannot be ascertained, which is the

circumstance in this case. Here, the question is not whether the applicable technique has a

known rate of error or whether the expert could correctly calculate a rate of error. Rather,

the question is whether the expert had access to sufficient information to render a reliable

opinion. The answer is plainly no.

On brief before this Court, Matthews specifically contended that “[t]the Court of

Special Appeals correctly concluded that there was an ‘analytical gap’ between the data

available for reverse photogrammetry in this case and the ‘specific height estimate’ that

Meline offered the jury.” Matthews argued:

The analytical gap analysis is nothing more than a reliability test. City of San
Antonio v. Pollock, 284 S.W.3d 809, 822 (Tex. 2009) (“Analytical gaps can
undermine the reliability of an expert’s opinion. The Supreme Court said as
much in … Joiner, [ ] observing that courts … are free to test reliability by
analyzing whether the expert’s opinion fits the facts of the case.”).
The concept of an analytical gap between the facts available and the
conclusion offered, as set forth in Joiner, 522 U.S. at 146, is captured by Rule
5-702(3)’s requirement that a sufficient factual basis exists to support the
expert testimony. “‘[S]ufficient factual basis’ includes two sub-elements: (1)
an adequate supply of data; and (2) a reliable methodology.” Rochkind, 471
Md. at 22. See § 22:13. Fit, 3 Mod. Sci. Evidence § 22:13 (2020-2021
Edition) (“The fit concept is now captured in Federal Rule of Evidence
702(b) that requires the testimony to be ‘based on sufficient facts or data.’
Courts increasingly rely on this section rather than the Joiner ‘fit’ language
to exclude expert evidence.”). As this Court has explained, the concept of an
analytical gap simply means that “generally accepted methodology ‘must be
coupled with generally accepted analysis’….” Rochkind, 471 Md. at 17
(quoting Blackwell, 408 Md. at 608). Joiner, 522 U.S. at 146[] (“A court

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 may conclude that there is simply too great an analytical gap between the
data and the opinion proffered.”).

The record demonstrates that the State’s expert testified, among other things, that

due to several variables the degree of uncertainty with respect to her conclusions could be

greater. Specifically, on cross-examination, the following exchange occurred:

[MATTHEWS’S COUNSEL]: Okay, which means ultimately, we don’t
know how uncertain this result is?

[MELINE]: I would say that I have some indication based on the overlay of
my own, myself in that similar position with the image of the questioned
individual and knowing that the questioned individual appeared to be slightly
shorter than I, myself, am that I have some indication as to the uncertainty
with the method. However, there are factors in here that I cannot calculate.

***

[MATTHEWS’S COUNSEL]: [A]s here where the conditions are far from
pristine, [the] margin of error is going to become greater it stands to reason,
right?

[MELINE]: It does.

When asked by Matthews’s counsel about the statement in her report that “the

degree of uncertainty in this measurement could be significantly greater” based on several

variables, including “the subject to camera distance, the resolution of the imagery, the

unevenness of the landscape, and the body position of the subject,” the expert

acknowledged: “I don’t have a scientific way of quantifying how those dimensions had an

effect on my measurement and consequently I wanted in an abundance of caution to

mention them.”

Insofar as to whether it was an abuse of discretion for the circuit court to admit the

expert’s testimony under Maryland Rule 5-702, I would hold that it was because an

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analytical gap clearly existed between the facts—known and unknown to the expert—and

the conclusions that were drawn by the expert. Under Maryland Rule 5-702, expert

testimony is admissible where it “will assist the trier of fact to understand the evidence or

to determine a fact at issue.” A “court shall determine (1) whether the witness is qualified

as an expert by knowledge, skill, experience, training, or education, (2) the appropriateness

of the expert testimony on the particular subject, and (3) whether a sufficient factual basis

exists to support the expert testimony[]” in deciding whether the testimony will be

admissible. Md. R. 5-702. The “hallmark” of [an] analytical gap is “the failure by the

expert witness to bridge the gap between his or her opinion and the empirical foundation

on which the opinion was derived.” Sugarman v. Liles, 460 Md. 396, 425, 190 A.3d 344,

361 (2018) (quoting Savage, 455 Md. at 163, 166 A.3d at 183). In order “[t]o bridge the

analytical gap, an expert’s testimony must have a sufficient factual foundation.” Id. at 427,

190 A.3d at 362 (quoting Savage, 455 Md. at 163, 166 A.3d 183).

In Joiner, 522 U.S. at 146, the Supreme Court held that a trial court’s decision to

admit “scientific evidence” is reviewed under an abuse of discretion standard of review,

and that in a trial court’s discretion, it “may conclude that there is simply too great an

analytical gap between the data and the opinion proffered[]” and refuse to admit the

testimony on that basis. In Joiner, a plaintiff offered testimony of experts to support an

argument that exposure to a chemical in the workplace “promoted” the development of the

plaintiff’s lung cancer. Id. at 139-40. The experts relied upon studies for their conclusions,

including animal studies as well as four epidemiological studies. See id. at 146. The trial

court refused to admit the expert testimony because the studies relied upon did not support

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the conclusions of the experts, i.e., given the lack of support, the proffered opinions failed

to transcend “subjective belief or unsupported speculation.” Id. at 140 (citations omitted).

The United States Court of Appeals for the Eleventh Circuit reversed, determining that the

trial court exceeded its authority in refusing to admit the evidence. See id. at 141.

After clarifying that abuse of discretion was the correct standard of review, the

Supreme Court held that the Court of Appeals failed to accord deference to the trial court

and that the trial court did not abuse its discretion. See id. at 143. Specifically, it was not

an abuse of discretion for the trial court to reject the reliance on animal studies, where the

animals in question—infant mice—received “massive” doses of the chemical and Joiner,

an adult man, received much less. Id. at 144-45. Likewise, the trial court did not abuse its

discretion in rejecting the experts’s reliance on the epidemiological studies because the

studies either did not “support” a “conclusion that [the plaintiff’s] exposure to [the

chemical] caused his cancer[,]” “did not suggest a link between the increase in lung cancer

deaths and the exposure to the [chemical,]” made no mention of the chemical, or in one

study, involved “subjects” who “had been exposed to numerous potential carcinogens”

beyond the chemical at issue and consequently failed to afford a sufficient factual basis for

the asserted conclusions. Id. at 144-46. In rejecting Joiner’s argument that under Daubert

a trial court may consider only the principles and methodology as opposed to the

conclusions of the expert, the Supreme Court explained that “nothing in either Daubert or

the Federal Rules of Evidence requires a district court to admit opinion evidence that is

connected to existing data only by the ipse dixit of the expert[,]” and that on the contrary,

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“[a] court may conclude that there is simply too great an analytical gap between the data

and the opinion proffered.” Joiner, 522 U.S. at 146.

In Rochkind v. Stevenson, 454 Md. 277, 295, 164 A.3d 254, 264 (2017), this Court

held that a trial court abused its discretion in permitting the plaintiff’s expert testimony

under Maryland Rule 5-702 where the court “failed to check for an ‘analytical gap’ between

the expert's data and her conclusion.” In order to testify that exposure to lead paint caused

Stevenson’s ADHD, the expert relied on an EPA-ISA paper, which discussed the fact that

multiple studies had found a causal relationship between exposure to lead and some

symptoms of ADHD, but not ADHD itself. See id. at 288, 164 A.3d at 260. This Court

explained that Maryland Rule 5-702(c)’s requirement of a “sufficient factual basis . . . to

support the expert testimony[]” involves assessment of two factors: “adequate supply of

data and a reliable methodology.” Id. at 286, 164 A.3d at 259 (quoting Roy v. Dackman,

445 Md. 23, 42–43, 124 A.3d 169 (2015)).

This Court concluded that the expert failed to supply adequate data to support the

conclusion that lead exposure caused ADHD where the discussion of the studies in the

EPA-ISA paper did not say that lead exposure caused ADHD, but rather indicated that such

exposure caused only some symptoms associated with ADHD. Id. at 291-94, 164 A.3d at

262-64. To render an opinion, the expert needed to “jump” from studies showing that lead

exposure causes symptoms of ADHD to an opinion that it caused “a clinical ADHD

diagnosis[.]” Id. at 291, 164 A.3d at 262. Although “seem[ingly] reasonable,” this Court

stated that such a jump was an analytical gap of the sort discussed in Joiner, and that it was

an overstatement and impermissible especially given “the added weight a jury might give

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to testimony from a designated expert[.]” Rochkind, 454 Md. at 291, 164 A.3d at 262

(citations omitted).

By contrast, in Sugarman, 460 Md. at 427-29, 190 A.3d at 362-63, another lead

exposure case, this Court perceived no analytical gap in an expert’s conclusion that lead

exposure caused the plaintiff’s defects in auditory encoding and processing speeds based

on the EPA-ISA’s discussion of lead exposure’s tendency to cause general attention

defects—even though the EPA-ISA did not identify the specific types of attention

disorders—because the experts explained that defects in auditory encoding and processing

speeds fell within the umbrella of general attention defects.

As in Joiner and the earlier opinion in Rochkind, in this case, I would hold that there

was an analytical gap between the expert’s opinion as to the height of the suspect and the

data available, where the expert acknowledged that she did not “have a scientific way of

quantifying how” missing variables, i.e., unknown information such as the “subject to

camera distance, the resolution of the imagery, the unevenness of the landscape, and the

body position of the subject,” would have “had an effect on [her] measurement.” The

expert testified honestly that the missing information all meant that the margin of error as

to her calculations could be much greater than estimated. In other words, the expert

essentially testified that she could not assure the reliability of her test results. Similar to

one of the studies at issue in Joiner, 522 U.S. at 144-46, which showed increased cancer

rates but which did not serve as a sufficient factual predicate for the proposition that a

specific chemical caused cancer because the expert failed to account for the numerous other

toxins to which the subjects in the study were exposed, in this case, numerous unavailable

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pieces of information prevented the State’s expert witness from rendering a reliable

opinion. As the Court of Special Appeals stated, “the analytical gap between the data

available for reverse photogrammetry projections and the conclusion [the expert] offered

to the jury remained unbridged.” Matthews, 249 Md. App. at 544, 246 A.3d at 664.

In this case, in addition to all of the above, the expert acknowledged that the trainee

who assisted her with making the height estimate identified “difficulties” with the

photograph chosen for the photogrammetric analysis. Among other things, the trainee

noted “issues with not being able to see the suspect’s feet clearly[]” and stated that “not a

lot of detail could be seen in any of the enhanced images[.]” Significantly, the expert

acknowledged that when authorities were considering whether to even go forward with a

reverse photogrammetric analysis in the case, her trainee had estimated a margin of error

of plus or minus three inches.

As to the relevant terrain, the expert indicated that in the photograph the suspect

stood in a grassy area. The expert testified that she visited the scene at the end of

November. Thomas Lancaster, a private investigator, testified on behalf of the defense that

the terrain was different every time he visited, and “very different” between the winter and

summer months because in summer, the ground was less solid overall and because grasses

and other vegetation obscured the scene.

On recross-examination, the State’s expert testified, in part, about the terrain as

follows:

[MATTHEWS’S COUNSEL:] Okay. You spoke about foot placement of
the individual and you testified that you aligned your own leg and foot to
mimic what you saw in the individual from the questioned image, correct?

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 [MELINE:] That’s correct.

[MATTHEWS’S COUNSEL:] Now that in itself still doesn’t tell us anything
about the footwear of the individual in the questioned image, correct?

[MELINE:] That’s correct.

[MATTHEWS’S COUNSEL:] And it doesn’t tell us anything about whether
that person may have been standing in some kind of hole or divot or on a hill
or something of that nature, correct?

[MELINE:] I would disagree, because in this particular case because I was
on scene I was able to see the land on which I was standing. And with the
exception of the possibility of changes in the terrain between June and
November, I would say that my ability to stand where the individual was
standing tells me what the terrain was in that location.

[MATTHEWS’S COUNSEL:] So certainly you were there November 28th,
you weren’t out there June 1st, correct?

[MELINE:] No, I was not there June 1st.

[MATTHEWS’S COUNSEL:] You weren’t out there anytime before
November 28th, 2017, nearly six months later, correct?

[MELINE:] That’s correct.

[MATTHEWS’S COUNSEL:] Okay. So you wouldn’t be aware of what
kind of minor changes in terrain there might have been within that time?

[MELINE:] No, ma’am.

Beyond the differences between the terrain’s features in summer versus winter, Mr.

Lancaster also testified that the property is uneven, with depressions, ditches, and downed

trees or branches, that the ground is “marshy in a lot of places especially in the wooded

area surrounding” the house, and that the region overall is a peninsula which is “mostly at

or below sea level” characterized by swampy, sandy, and marshy conditions.

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 The suspect’s headwear and foot positioning presented other uncertainties that

affected the expert’s opinion. The expert acknowledged that in the photograph the suspect

appeared to be wearing a hat and that given her inability to calculate the impact of the

headwear, she provided an estimate of the suspect’s height including any headwear. As

for the position of the suspect’s feet, the expert testified that because in the photograph the

left heel was difficult to see, she determined the position of the suspect’s heel by visiting

the scene and assessing the terrain, which she indicated is a best practice. But the expert

visited the scene at a time when the terrain would have been “very different” from when

the image in the photograph was captured and the expert acknowledged that “changes in

the terrain between June and November” could have undermined her assessment of the

terrain and by extension her assessment of the suspect’s foot placement.

In contrast to the State’s expert, Robert Sanderson an expert in photogrammetry,

who testified on behalf of the defense, testified that unknown information created

uncertainty in any estimate of the suspect’s height. Mr. Sanderson expressed the opinion

that it was not possible to provide a height estimate from the image chosen by the State’s

expert using photogrammetry in light of the unknown information. Mr. Sanderson

explained that even with “contrast adjustment and sharpening” applied to the image, he

could “not really see[] the detail [he would] need to see” with respect to “[f]oot placement,

footwear, headwear[,]” or “terrain.” Mr. Sanderson testified that these were “core”

variables, and the State’s expert acknowledged that they were “unknowns[.]” In addition,

Mr. Sanderson identified the issue of whether the camera had moved after the video had

been taken as an additional variable because “[c]ertain movements of the camera . . . can

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affect the end result[,]” and he questioned the State’s expert’s method of compensating for

the movement. At bottom, Mr. Sanderson’s testimony did not result in conflicting expert

opinion (a circumstance often encountered at trials with expert testimony), but rather his

testimony was that of another expert in the field of photogrammetric analysis essentially

identifying the existence of an analytical gap between the available facts and the ability to

render a reliable opinion.

Although the State’s expert testified extensively as to her qualifications in the area

of photogrammetry and regarding her methodology in conducting an analysis of the

photograph at issue, this does not change the underlying requirement of Maryland Rule 5-

702(c) that a sufficient factual basis support the expert’s opinion. Maryland Rule 5-702

does not require perfection. In this case, though, the expert recognized the significance of

unknown information on the reliability of her opinion when she testified that there was no

“scientific way of quantifying” how the missing information would have affected her

work.1

The overarching inquiry in admission of expert testimony is a determination that it

is reliable. See Daubert, 509 U.S. at 589 (“[U]nder the Rules [of Evidence] the trial judge

must ensure that any and all scientific testimony or evidence admitted is not only relevant,

but reliable.”). As the Supreme Court recognized in Daubert, the trial court is in essence

the “gatekeep[er]” of reliability and this function will “inevitably on occasion . . . prevent

In light of the expert’s acknowledgment that she did not have a scientific way of
1

quantifying how the missing information affected her measurement, any probative value
with respect to the expert’s opinion was substantially outweighed by the danger of unfair
prejudice. See Md. R. 5-403.

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the jury from learning of authentic insights and innovations.” Id. at 597.

It will not be the case that an analytical gap will exist in every instance in which an

expert cannot account for unknown facts. But in this case unknown information, such as

the condition of the terrain on which the person stood, the distance of the person from the

camera, and the positioning of person’s body, and the poor quality of the photograph at

issue, created an analytical gap that the expert herself recognized when she acknowledged

that she had no way of calculating the effect that the missing information had on the

outcome of her measurements. Although the expert indicated that she felt comfortable with

her analysis, the missing variables concerned core information that an expert performing a

reverse projection photogrammetric analysis would have needed to render a reliable

opinion. There can be no reasonable quarrel with the Court of Special Appeals’s

determination in this case that it was an abuse of discretion to admit expert testimony where

the expert essentially acknowledged that she could not say that her opinion was reliable.2

2
This is not a case of harmless error. To hold that the admission of the State’s
expert’s testimony was harmless, a determination must be made “beyond a reasonable
doubt, that the error in no way influenced the verdict[.]” Dionas v. State, 436 Md. 97, 108,
80 A.3d 1058, 1065 (2013) (quoting Dorsey v. State, 276 Md. 638, 359 A.2d 665, 678
(1976)). No such determination could be reached here. Although the State argues that
witnesses testified to seeing Matthews approach the victims with a gun, that does not get
around the fact that the State’s expert testimony was the only scientific evidence
implicating Matthews, the State’s lay witnesses were beset with credibility problems, none
of the State’s witnesses purported to have witnessed the shooting, and Bragg’s testimony
was “important” to the defense because “Matthews is African American, whereas Bragg
described seeing a white man with blonde hair carry and ‘cock’ a shotgun in front of her
house[,]” Maj. Slip Op. at 22. Indeed, the Court of Special Appeals described the
circumstances of the case as follows:

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 For the above reasons, respectfully, I dissent.

The story of this case is complicated and hard to follow. A great many people
were involved; many of them are related, others have lived in the affected
neighborhood for years. Everything happened late at night, and the
participants’ vision and memories were incomplete and frequently clouded
by substances. There was some video footage, but it too was incomplete.
The challenge for everyone lay in piecing together fragments of evidence that
took many different forms.

Matthews, 249 Md. App. at 516, 246 A.3d at 648.

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