Doreen Smith appeals her conviction following trial to a jury of involuntary manslaughter arising from a vehicular accident on the Navajo Indian Reservation near Gallup, New Mexico, on March 5, 1983. The accident occurred about 8:30 p.m.; it was a head-on collision between a Pontiac Trans-Am, driven by Smith, and a Honda 350 motorcycle. The motorcyclist, James Radloff, was killed. Smith and Francis Benally, another occupant of the car, were taken to a hospital in Shiprock, New Mexico. A third occupant of the car, Herman Tanner, apparently walked away from the accident scene and turned up in Farmington, New Mexico, the next morning.
Smith, Benally, and Tanner all live in Farmington. On March 5, they took a trip from Farmington west to Shiprock and then south to Gallup in Tanner’s Pontiac Trans-Am. The trip began with Tanner driving the vehicle. Tanner and Benally were drinking beer during the trip, but Smith, tired from a late night, soon fell asleep in the back of the vehicle. They arrived in Gallup around 5:30 p.m., where the vehicle was stopped by the Gallup police. Tanner was given citations for having expired license plates and for driving without a license, although both he and Benally *894passed field sobriety tests. Benally then took over the driving and the threesome left Gallup and headed north back toward Shiprock. Along the road Benally stopped the car for a “restroom stop.” Since both Benally and Tanner had been drinking, Smith took over the driving. For some reason, she had turned the car around and was driving south, back toward Gallup, when the accident occurred.
The road at the accident scene is straight; there are no hills or obstructions in the vicinity. There is one lane in either direction and paved shoulders. R. Yol III at 474. The point of impact of the car and the motorcycle was approximately three and one-half feet from the shoulder line in the northbound (east) lane. The motorcycle’s rear tire left a skid mark in the northbound lane before impact; the car’s tires left no skid marks before impact, but all four tires left skid marks after impact leading into the southbound lane where the car came to rest.
The first Navajo police officer at the scene was Sam Ahkeah. He smelled a strong odor of liquor from the breath of both Smith and Benally. R.Vol. Ill at 389. Suspecting that they may have been intoxicated, Ahkeah brought the police department’s “Intoxilyzer” machine to the hospital where Smith and Benally had been taken, and obtained breath samples from both of them. Benally tested at 0.17% blood alcohol content (BAC) at 9:46 p.m., Gov’t. Exh. 33, and Smith tested at 0.16% BAC at 10:38 p.m., Gov’t.Exh. 26.
Smith was indicted on June 29, 1983. The indictment charged that she had operated a motor vehicle in a “grossly negligent manner,” with “knowledge of circumstances that made it reasonably foreseeable that her acts might imperil the lives of others.” R.Vol. I at 1. Smith’s first trial, at which she testified, ended in a hung jury; consequently a mistrial was declared. The second trial, at which Smith did not testify, ended in a guilty verdict and conviction.
The government’s version and Smith’s version of how the accident happened differ dramatically. The government’s version is that Smith was driving while intoxicated and was in the wrong lane because of negligence. Smith’s version is that: she had not been intoxicated at all, having had only two beers that morning and nothing at all to drink since then; she had swerved into the wrong lane to avoid the motorcycle, which had been in her lane shortly before impact; and, the collision occurred because the motorcycle had quickly returned to its own lane.
On appeal, Smith challenges several of the court’s evidentiary rulings during the second trial. Additional facts, as they become relevant, will be related in considering these challenges.
I.
Smith contends that the court denied her due process right to a fair trial by denying her the opportunity to present her defense — her version of how the accident happened — when it refused to allow her attorney to question a witness during the second trial about a prior inconsistent statement he made at the first trial. The witness was John T. Hayes, a New Mexico state police officer and a traffic accident reconstruction specialist. At the first trial, Hayes concluded during cross-examination that, based on the physical evidence at the accident scene, the ear must have been in the northbound (wrong) lane for a minimum of 131 feet before impact:
Q. [Defense counsel] Now, I want to turn your attention to the car, ... given what you understand is the road marks and skid marks and all that sort of thing, given the facts as you have previously interpreted them, as to the point of impact and the marks or lack of marks here.
How far away in feet, and then again in time, could it have been that this car was where it was at the the [sic] time of impact, and yet have been in its lane prior to that, given all the physical evidence that was at the scene, and given the size of the car and all these things, and assuming that the car was going 50 miles an hour?
*895MR. TORREZ [Prosecutor]: Is he to assume a certain speed for the motorcycle in her hypothetical?
THE COURT: I think she said 55.
MS. INDRITZ [Defense counsel]: I don’t think this question even involves the the speed of the motorcycle. It involves the distance between the car being at the point of impact and the car being in its lane.
A. [Hayes]: Okay. There are two figures, and I will explain what they are. Had there been very hard steering, just beyond the point — or just below the point at which a mark would have been left, for the cars to come up in the fashion that they were, in order for the vehicle to recover and come back somewhat in a more straight position, would require about 131 feet.
BY MS. INDRITZ:
Q. And how does 131 feet translate into time at the rate of 50 miles an hour?
A. It would be 1.8 seconds.
Q. So, in other words, if Doreen was correct that she was in her lane and all the physical evidence is as you previously testified it was, including the point of impact and the marks and so on, she could have been in her lane here arid then be here in the position of impact 1.8 seconds prior to the collision?
A. Yes, ma’am.
(First trial transcript, R. Supp. Vol. VIII at 551-53.)
The fact that Hayes’s conclusion was based on the physical evidence as it actually existed was underscored a few minutes later on re-cross-examination:
BY MS. INDRITZ:
Q. Your testimony is that if the steering were below that degree of strength required to leave the yaw marks, right—
A. Yes, ma’am.
Q. —so, therefore, your testimony is based on the facts as you understand them to be, based on your evaluation of the evidence?
A. Based on the evaluation of the physical evidence.
Q. Based on the evaluation of all the physical evidence, she could have been in her lane 131 feet or 1.8 seconds prior to impact, where the impact occurred?
A. I believe so.
(First trial transcript, R.Supp.Vol. VIII at 555.)
Smith was thus able to establish at the first trial, through witness Hayes’s testimony, that the car must have been in the wrong lane for a relatively short distance (131 feet) and time (1.8 seconds) before impact. The physical evidence gave no indication, one way or the other, about where the car may have been prior to 1.8 seconds before impact. Thus, as Smith stresses, it was possible that she was in the right lane prior to 1.8 seconds before impact. In other words, although Smith did not steer left into the oncoming lane hard enough to leave yaw (scuff) marks, she still could have steered left fairly quickly without leaving such marks. Thus, she claims, her version of the way the accident happened was not inconsistent with the physical evidence.
At the second trial, Hayes was again called to testify, this time as a defense witness. When defense counsel again asked for his conclusion as to the minimum distance and time that the car must have been in the wrong lane prior to impact, Hayes could not answer because he had not been given a speed for the car that he could base his calculations upon. (Hayes had assumed a speed of 50 m.p.h. in the first trial based upon Smith’s testimony to that effect, but there had been no testimony yet as to the car’s speed in the second trial.) The following exchange occurred between defense counsel and Hayes:
Q. Can you tell how far back the TransAm would had to cross the center line in order to be at the point of impact at the time of impact?
A. Again, not without having some type of a speed to deal with on the part of the TransAm.
* sfc H? * * *
Q. But if you knew a speed you would be able to give us that information?
*896A. Yes, ma’am.
Q. And you would also be able to give us a time?
A. Yes, ma’am.
(R.Vol. III at 487-88.)
Later in the trial, the speed of the car and Smith’s alleged evasive maneuver were established, R.Vol. Ill at 610-11, and Hayes was subsequently recalled. The physical evidence in the record was now, for all practical purposes, identical to the physical evidence upon which Hayes’s conclusion at the first trial had been based. When defense counsel again asked for Hayes’s conclusion, the court interrupted and asked the witness what facts he was basing his calculations on. R.Vol. Ill at 674-75. An exchange between the witness, defense counsel, the prosecutor, and the court followed, the result of which was that the witness testified that he could not make any conclusions without assuming the presence of yaw marks on the road prior to impact:
BY MS. INDRITZ:
Q. My question is, given the evidence that is there, given the evidence as you know it to be, can you tell us the minimum distance that this vehicle had to have been in this lane, the northbound lane, in order to be at the point of impact that you described the point of impact was?
MR. TORREZ: To which I would object.
THE COURT: Hold on a minute, before you make an objection. I thought that was just the question that I asked him. Mr. Witness, isn’t that correct?
A. Yes, that I have to have the yaw marks, I have to have some marks here to indicate that and bring it up to that minimum.
THE COURT: Then on that basis, I will sustain the objection and he will not give that figure, or he cannot give that figure to the jury because he doesn’t know what it would be.
MR. TORREZ: I would also like to point out that he is assuming that it is a driver that is operating and functioning normally-
THE COURT: I am taking all that into consideration when I refused to allow him to testify to that.
BY MS. INDRITZ:
Q. Now, I asked you the same question at the last trial in this case, didn’t I?
A. Yes, ma’am, and I believe that our understanding was that it would again have to be with those marks.
MR. TORREZ: I would also like to point out to the jury that at the time that question was asked, he had heard — he had heard additional evidence.
THE COURT: Yes, and we are not going to go into that, counsel. That is a matter previous to this. This is a new jury.
(R.Vol. III at 678-79.)
Following this exchange, the jury left the courtroom and defense counsel made an offer of proof of Hayes’s testimony at the first trial, with the request that she be allowed to impeach Hayes with his prior inconsistent statement. The court refused the request, apparently based on the ground that there was a lack of foundation:
MS. INDRITZ: The Court places me in a difficult position, but I think that it’s important for me to get into the record what I asked him last time, because what I asked him last time assumed all the facts to be true.
THE COURT: What you asked him last time, you are not asking him to impeach him. You are just trying to get the facts, some additional facts into evidence.
MS. INDRITZ: No, your Honor, I am asking to impeach him. I am asking to impeach him because he now says that he can’t answer a question when he answered the exact same question before, based on the exact same physical evidence.
THE COURT: And, counsel, I am trying to tell you that assuming the facts are the same, that we are not ever going to get to that point, because I am telling you that he cannot answer the question because these facts are not in evidence. Period.
(R.Vol. III at 687.)
The record does not clearly delineate the precise evidentiary issues that were in*897volved. For example, it is not clear whether defense counsel wished to make use of Hayes’s prior inconsistent statement for impeachment purposes only, or whether she intended to use the prior inconsistent statement as substantive evidence to corroborate Smith’s version of how the accident happened. Likewise, the court’s decision to exclude Hayes’s prior statement for all purposes apparently was based on the ground that there was no foundation in the second trial for Hayes to make such a statement. The rationale of the court’s ruling seems incongruous; even assuming the court was correct that foundation was lacking, lack of foundation to state a conclusion the witness refused to state anyway simply has nothing to do with the question of whether use of the witness’s prior inconsistent statement was proper in the context offered.
These mysteries need not, however, detain us. The witness’s statement at the first trial (i.e., that he could conclude, based on the physical evidence as it existed, that the car had been in the wrong lane for a minimum of 131 feet prior to impact) was plainly inconsistent on its face with the statement he made in the second trial (i.e., that he could make no conclusion, based on the physical evidence as it existed, about the car’s position prior to impact). There was no reason, assuming the proper procedures had been followed, why defense counsel should not have been able to question the witness about his prior inconsistent statement in an attempt to impeach him. See Fed.R.Evid. 613; United States v. Sisto, 534 F.2d 616, 622-23 (5th Cir.1976). Furthermore, because the prior inconsistent statement was originally given under oath and the witness was subject to cross-examination concerning the statement, the prior inconsistent statement itself was admissible as substantive evidence under Fed. R.Evid. 801(d)(1)(A). United States v. Silverstein, 737 F.2d 864, 867 (10th Cir.1984); United States v. Plum, 558 F.2d 568, 575 (10th Cir.1977). Therefore, the trial court erred in refusing to allow inquiry about Hayes’s prior testimony, whatever purpose such inquiry may have been directed toward. Any foundation problems that may have been relevant for the purpose of explaining the apparent inconsistency between Hayes’s two positions would presumably have been brought to the jury’s attention through further questioning of Hayes by the government or even by the court.
Although we hold that the court erred in refusing to allow defense counsel to question Hayes about his prior inconsistent statements, we are convinced from our review of the record that the error was harmless. While the prior testimony might have worked to impeach Hayes, we have not read anything in Hayes’s testimony at the second trial that was damaging to Smith. Hayes had been called as a defense witness. His testimony consisted primarily of a description of the accident scene which corroborated a description already given by another police officer, Evan Lee, and which was no different from Hayes’s testimony at the first trial. There was nothing in Hayes’s testimony in the second trial that harmed Smith’s case; thus, it was not important for Smith’s defense that Hayes be impeached. The only real value of Hayes’s prior testimony, then, would have been as substantive evidence. Hayes’s scientific conclusions could have been presented to the jury even though Hayes would not repeat them. Even this would have been of limited value for Smith, however. As mentioned earlier, Hayes’s conclusion that the car must have been in the wrong lane for 131 feet before impact gave no indication, one way or the other, about where the car might have been prior to 131 feet before impact; the car could have been in either lane. Hayes’s conclusion, in fact, was harmful to Smith to the extent that it showed that she had definitely not swerved hard enough to cause yaw marks before impact. Furthermore, a review of the case that Smith’s counsel presented (i.e., the content of the opening and closing statements and the content of the defense witnesses’ testimony) shows that the focus was on the question whether Smith was intoxicated. Inasmuch as Smith did not testify, the only evidence that Smith had *898swerved to the left to avoid the collision was the testimony of FBI Agent Felter, to whom Smith had spoken after the accident. R.Vol. Ill at 610-11. Hayes’s prior testimony, had it been admitted for substantive purposes, would neither have corroborated nor refuted the idea that Smith had swerved to the left in order to avoid the oncoming motorcycle. The exclusion of that testimony was, at most, harmless error.
II.
Smith contends that the court abused its discretion in admitting evidence of the “Intoxilyzer” breath test results. Smith claims the test results were unreliable because (1) the machine had not been calibrated in approximately two months, (2) the machine had been moved and jostled on the way from police headquarters to the hospital, and (3) no breath sample was saved for later retesting, and therefore the results had little probative value and should not have been admitted.
This is essentially a claim that the court abused the broad discretion it has under Fed.R.Evid. 403 to exclude evidence whose prejudicial effect outweighs its probative value. United States v. Martinez, 744 F.2d 76, 80 (10th Cir.1984). We hold that the court did not abuse its discretion in
y admitting the test results. The technique of testing breath samples for blood alcohol content has general acceptance in the scientific community, and thus meets the classic test for admissibility of scientific evidence that was given in Frye v. United States, 293 Fed. 1013, 1014 (D.C.Cir.1923). The reasons given by Smith why the results may have been unreliable went to the weight of the evidence, not to its admissibility. Smith’s counsel had the opportunity to explore the consequences of any defects that may have occurred in the testing procedures and did so, particularly with witness John Zettl.
Smith makes a similar Rule 403 argument in claiming that the court abused its discretion in admitting three photographs of the ear and of the victim lying in the roadway, particularly since she had already formally admitted that the victim died as a result of injuries sustained in the accident. R.Vol. I at 203. Again, we see no reason to disturb the exercise of the court’s discretion in this matter. The court examined the four photographs objected to (Gov’t.Exh. # 2, 3, 4, 5) and excluded two of them. R.Vol. II at 272-73. The other two were admitted because of their probative value in depicting the accident scene, including paint markers used as reference points. The photograph of the car (Gov’t. Exh. 22) was admitted because of its probative value as to point of impact. R.Vol. II at 257-260.
Smith has made a number of other contentions that the court erred in admitting evidence that was irrelevant or that probative value was outweighed by prejudicial effect. We have considered each of them and hold that they are without merit. The trial court acted within its discretion in each instance.
III.
Smith claims that a statement she made to Edward Boggio, a criminal investigator for the Bureau of Indian Affairs concerning how the accident happened should have been suppressed because she was not given her Miranda rights before she made the statement. The record, however, shows that Smith had, in fact, been given her Miranda rights, although not by Boggio. R.Vol. Ill at 440, 449. Furthermore, the statement she made to Boggio was spontaneous; it was not a result of any questions or interrogation by Boggio. R.Vol. Ill at 457. See Rhode Island v. lnnis, 446 U.S. 291, 301, 100 S.Ct. 1682, 1689, 64 L.Ed.2d 297 (1980); Mincey v. Arizona, 437 U.S. 385, 398, 98 S.Ct. 2408, 2416, 57 L.Ed.2d 290 (1978). Under the circumstances, we hold that there was no violation of the rule of Miranda v. Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966).
IV.
Smith has made a number of other allegations of error. These include (1) allow*899ing the scope of direct examination of witness Felter to be exceeded on cross-examination, (2) prosecutorial misconduct in the form of improper comment on the defendant’s failure to testify, (3) failure to rule on a motion in limine concerning Smith’s prior misdemeanor conviction, (4) abuse of discretion in conducting the voir dire of potential jurors, (5) improper use of judicial notice. We have considered each of these allegations and find them to be uniformly without merit. Smith presented this court with over a dozen separate allegations of error. We observe that the sheer quantity of allegations does not, in itself, lend validity to each individual allegation. Furthermore, we find no indication of cumulative error in the record. This is not a case where a number of errors occurred, all of which were harmless in themselves, but with cumulative prejudicial effect. Rather, we have sifted through these allegations of error and hold that the court did not err in its rulings, with but one exception. That exception, as we have noted, was harmless because the focus of the defendant’s case was elsewhere.
WE AFFIRM.