(Slip Opinion) OCTOBER TERM, 2005 1
Syllabus
NOTE: Where it is feasible, a syllabus (headnote) will be released, as is
being done in connection with this case, at the time the opinion is issued.
The syllabus constitutes no part of the opinion of the Court but has been
prepared by the Reporter of Decisions for the convenience of the reader.
See United States v. Detroit Timber & Lumber Co., 200 U. S. 321, 337.
SUPREME COURT OF THE UNITED STATES
Syllabus
UNITED STATES v. GRUBBS
CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR
THE NINTH CIRCUIT
No. 04–1414. Argued January 18, 2006—Decided March 21, 2006
A Magistrate Judge issued an “anticipatory” search warrant for re-
spondent Grubbs’ house based on a federal officer’s affidavit. The af-
fidavit explained that the warrant would not be executed until a par-
cel containing a videotape of child pornography—which Grubbs had
ordered from an undercover postal inspector—was received at, and
physically taken into, the residence. The affidavit also referred to
two attachments describing the residence and the items to be seized.
After the package was delivered and the search commenced, Grubbs
was given a copy of the warrant, which included the attachments but
not the supporting affidavit. When he admitted ordering the video-
tape, he was arrested, and the videotape and other items were seized.
Following his indictment for receiving child pornography, see 18
U. S. C. §2252(a)(2), Grubbs moved to suppress the seized evidence,
arguing, inter alia, that the warrant was invalid because it failed to
list the triggering condition. The District Court denied the motion,
and Grubbs pleaded guilty. The Ninth Circuit reversed, concluding
that the warrant ran afoul of the Fourth Amendment’s particularity
requirement, which, under Circuit precedent, applied to the condi-
tions precedent to an anticipatory warrant.
Held:
1. Anticipatory warrants are not categorically unconstitutional un-
der the Fourth Amendment’s provision that “no Warrants shall issue,
but upon probable cause.” Probable cause exists when “there is a fair
probability that contraband or evidence of a crime will be found in a
particular place.” Illinois v. Gates, 462 U. S. 213, 238. When an an-
ticipatory warrant is issued, the fact that the contraband is not pres-
ently at the place described is immaterial, so long as there is prob-
able cause to believe it will be there when the warrant is executed.
2 UNITED STATES v. GRUBBS
Syllabus
Anticipatory warrants are, therefore, no different in principle from
ordinary warrants: They require the magistrate to determine (1) that
it is now probable that (2) contraband, evidence of a crime, or a fugi-
tive will be on the described premises (3) when the warrant is exe-
cuted. Where the anticipatory warrant places a condition (other than
the mere passage of time) upon its execution, the first of these deter-
minations goes not merely to what will probably be found if the con-
dition is met, but also to the likelihood that the condition will be met,
and thus that a proper object of seizure will be on the described
premises. Here, the occurrence of the triggering condition—
successful delivery of the videotape—would plainly establish probable
cause for the search, and the affidavit established probable cause to
believe the triggering condition would be satisfied. Pp. 3–7.
2. The warrant at issue did not violate the Fourth Amendment’s
particularity requirement. The Amendment specifies only two mat-
ters that the warrant must “particularly describ[e]”: “the place to be
searched” and “the persons or things to be seized.” That language is
decisive here; the particularity requirement does not include the con-
ditions precedent to execution of the warrant. Cf. Dalia v. United
States, 441 U. S. 238, 255, 257. Respondent’s two policy rationales—
that setting forth the triggering condition in the warrant itself is nec-
essary (1) to delineate the limits of the executing officer’s power and
(2) to allow the individual whose property is searched or seized to po-
lice the officer’s conduct—find no basis in either the Fourth Amend-
ment or Federal Rule of Criminal Procedure 41. Pp. 7–9.
377 F. 3d 1072 and 389 F. 3d 1306, reversed and remanded.
SCALIA, J., delivered the opinion of the Court, in which ROBERTS,
C. J., and KENNEDY, THOMAS, and BREYER, JJ., joined, and in which
STEVENS, SOUTER, and GINSBURG, J., joined as to Parts I and II.
SOUTER, J., filed an opinion concurring in part and concurring in the
judgment, in which STEVENS and GINSBURG, JJ., joined. ALITO, J., took
no part in the consideration or decision of the case.
Cite as: 547 U. S. ____ (2006) 1
Opinion of the Court
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SUPREME COURT OF THE UNITED STATES
_________________
No. 04–1414
_________________
UNITED STATES, PETITIONER v. JEFFREY GRUBBS
ON WRIT OF CERTIORARI TO THE UNITED STATES COURT OF
APPEALS FOR THE NINTH CIRCUIT
[March 21, 2006]
JUSTICE SCALIA delivered the opinion of the Court.
Federal law enforcement officers obtained a search
warrant for respondent’s house on the basis of an affidavit
explaining that the warrant would be executed only after a
controlled delivery of contraband to that location. We
address two challenges to the constitutionality of this
anticipatory warrant.
I
Respondent Jeffrey Grubbs purchased a videotape
containing child pornography from a Web site operated by
an undercover postal inspector. Officers from the Postal
Inspection Service arranged a controlled delivery of a
package containing the videotape to Grubbs’ residence. A
postal inspector submitted a search warrant application to
a Magistrate Judge for the Eastern District of California,
accompanied by an affidavit describing the proposed op-
eration in detail. The affidavit stated:
“Execution of this search warrant will not occur
unless and until the parcel has been received by a
person(s) and has been physically taken into the resi-
dence . . . . At that time, and not before, this search
warrant will be executed by me and other United
2 UNITED STATES v. GRUBBS
Opinion of the Court
States Postal inspectors, with appropriate assistance
from other law enforcement officers in accordance
with this warrant’s command.” App. to Pet. for Cert.
72a.
In addition to describing this triggering condition, the
affidavit referred to two attachments, which described
Grubbs’ residence and the items officers would seize.
These attachments, but not the body of the affidavit, were
incorporated into the requested warrant. The affidavit
concluded:
“Based upon the foregoing facts, I respectfully submit
there exists probable cause to believe that the items
set forth in Attachment B to this affidavit and the
search warrant, will be found [at Grubbs’ residence],
which residence is further described at Attachment
A.” Ibid.
The Magistrate Judge issued the warrant as requested.
Two days later, an undercover postal inspector delivered
the package. Grubbs’ wife signed for it and took the un-
opened package inside. The inspectors detained Grubbs as
he left his home a few minutes later, then entered the
house and commenced the search. Roughly 30 minutes
into the search, Grubbs was provided with a copy of the
warrant, which included both attachments but not the
supporting affidavit that explained when the warrant
would be executed. Grubbs consented to interrogation by
the postal inspectors and admitted ordering the videotape.
He was placed under arrest, and various items were
seized, including the videotape.
A grand jury for the Eastern District of California in-
dicted Grubbs on one count of receiving a visual depiction
of a minor engaged in sexually explicit conduct. See 18
U. S. C. §2252(a)(2). He moved to suppress the evidence
seized during the search of his residence, arguing as rele-
vant here that the warrant was invalid because it failed to
Cite as: 547 U. S. ____ (2006) 3
Opinion of the Court
list the triggering condition. After an evidentiary hearing,
the District Court denied the motion. Grubbs pleaded
guilty, but reserved his right to appeal the denial of his
motion to suppress.
The Court of Appeals for the Ninth Circuit reversed.
377 F. 3d 1072, amended, 389 F. 3d 1306 (2004). Relying
on Circuit precedent, it held that “the particularity re-
quirement of the Fourth Amendment applies with full
force to the conditions precedent to an anticipatory search
warrant.” 377 F. 3d, at 1077–1078 (citing United States v.
Hotal, 143 F. 3d 1223, 1226 (CA9 1998)). An anticipatory
warrant defective for that reason may be “cur[ed]” if the
conditions precedent are set forth in an affidavit that is
incorporated in the warrant and “presented to the person
whose property is being searched.” 377 F. 3d, at 1079.
Because the postal inspectors “failed to present the affida-
vit—the only document in which the triggering conditions
were listed”—to Grubbs or his wife, the “warrant was . . .
inoperative, and the search was illegal.” Ibid. We granted
certiorari. 545 U. S. ___ (2005).
II
Before turning to the Ninth Circuit’s conclusion that the
warrant at issue here ran afoul of the Fourth Amend-
ment’s particularity requirement, we address the antece-
dent question whether anticipatory search warrants are
categorically unconstitutional.1 An anticipatory warrant
is “a warrant based upon an affidavit showing probable
——————
1 This issue is “predicate to an intelligent resolution of the question
presented.” Ohio v. Robinette, 519 U. S. 33, 38 (1996) (internal quotation
marks omitted). It makes little sense to address what the Fourth
Amendment requires of anticipatory search warrants if it does not
allow them at all. Cf. Wilkinson v. Austin, 545 U. S. ___, ___ (2005) (slip
op., at 9) (addressing whether inmates had a liberty interest in avoiding
assignment to a “Supermax” prison, despite the State’s concession that
they did, because “[w]e need reach the question of what process is due only
if the inmates establish a constitutionally protected liberty interest”).
4 UNITED STATES v. GRUBBS
Opinion of the Court
cause that at some future time (but not presently) certain
evidence of crime will be located at a specified place.” 2 W.
LaFave, Search and Seizure §3.7(c), p. 398 (4th ed. 2004).
Most anticipatory warrants subject their execution to
some condition precedent other than the mere passage of
time—a so-called “triggering condition.” The affidavit at
issue here, for instance, explained that “[e]xecution of
th[e] search warrant will not occur unless and until the
parcel [containing child pornography] has been received by
a person(s) and has been physically taken into the resi-
dence.” App. to Pet. for Cert. 72a. If the government were
to execute an anticipatory warrant before the triggering
condition occurred, there would be no reason to believe the
item described in the warrant could be found at the
searched location; by definition, the triggering condition
which establishes probable cause has not yet been satis-
fied when the warrant is issued. Grubbs argues that for
this reason anticipatory warrants contravene the Fourth
Amendment’s provision that “no Warrants shall issue, but
upon probable cause.”
We reject this view, as has every Court of Appeals to
confront the issue, see, e.g., United States v. Loy, 191 F. 3d
360, 364 (CA3 1999) (collecting cases). Probable cause
exists when “there is a fair probability that contraband or
evidence of a crime will be found in a particular place.”
Illinois v. Gates, 462 U. S. 213, 238 (1983). Because the
probable-cause requirement looks to whether evidence will
be found when the search is conducted, all warrants are, in
a sense, “anticipatory.” In the typical case where the
police seek permission to search a house for an item they
believe is already located there, the magistrate’s determi-
nation that there is probable cause for the search amounts
to a prediction that the item will still be there when the
warrant is executed. See People v. Glen, 30 N. Y. 2d 252,
258, 282 N. E. 2d 614, 617 (1972) (“[P]resent possession is
Cite as: 547 U. S. ____ (2006) 5
Opinion of the Court
only probative of the likelihood of future possession.”).2
The anticipatory nature of warrants is even clearer in the
context of electronic surveillance. See, e.g., Katz v. United
States, 389 U. S. 347 (1967). When police request approval
to tap a telephone line, they do so based on the probability
that, during the course of the surveillance, the subject will
use the phone to engage in crime-related conversations.
The relevant federal provision requires a judge authoriz-
ing “interception of wire, oral, or electronic communica-
tions” to determine that “there is probable cause for belief
that particular communications concerning [one of various
listed offenses] will be obtained through such intercep-
tion.” 18 U. S. C. §2518(3)(b) (emphasis added); see also
United States v. Ricciardelli, 998 F. 2d 8, 11, n. 3 (CA1
1993) (“[T]he magistrate issues the warrant on the basis of
a substantial probability that crime-related conversations
will ensue.”). Thus, when an anticipatory warrant is
issued, “the fact that the contraband is not presently
located at the place described in the warrant is immate-
rial, so long as there is probable cause to believe that it
will be there when the search warrant is executed.”
United States v. Garcia, 882 F. 2d 699, 702 (CA2 1989)
(quoting United States v. Lowe, 575 F. 2d 1193, 1194 (CA6
1978); internal quotation marks omitted).
——————
2 For this reason, probable cause may cease to exist after a warrant is
issued. The police may learn, for instance, that contraband is no longer
located at the place to be searched. See, e.g., United States v. Bowling,
900 F. 2d 926, 932 (CA6 1990) (recognizing that a fruitless consent
search could “dissipat[e] the probable cause that justified a warrant”).
Or the probable-cause showing may have grown “stale” in view of the
time that has passed since the warrant was issued. See United States
v. Wagner, 989 F. 2d 69, 75 (CA2 1993) (“[T]he facts in an affidavit
supporting a search warrant must be sufficiently close in time to the
issuance of the warrant and the subsequent search conducted so that
probable cause can be said to exist as of the time of the search and not
simply as of some time in the past.”); see also Sgro v. United States, 287
U. S. 206, 210–211 (1932).
6 UNITED STATES v. GRUBBS
Opinion of the Court
Anticipatory warrants are, therefore, no different in
principle from ordinary warrants. They require the mag-
istrate to determine (1) that it is now probable that (2)
contraband, evidence of a crime, or a fugitive will be on
the described premises (3) when the warrant is executed.
It should be noted, however, that where the anticipatory
warrant places a condition (other than the mere passage of
time) upon its execution, the first of these determinations
goes not merely to what will probably be found if the
condition is met. (If that were the extent of the probability
determination, an anticipatory warrant could be issued for
every house in the country, authorizing search and seizure
if contraband should be delivered—though for any single
location there is no likelihood that contraband will be
delivered.) Rather, the probability determination for a
conditioned anticipatory warrant looks also to the likeli-
hood that the condition will occur, and thus that a proper
object of seizure will be on the described premises. In
other words, for a conditioned anticipatory warrant to
comply with the Fourth Amendment’s requirement of
probable cause, two prerequisites of probability must be
satisfied. It must be true not only that if the triggering
condition occurs “there is a fair probability that contra-
band or evidence of a crime will be found in a particular
place,” Gates, supra, at 238, but also that there is probable
cause to believe the triggering condition will occur. The
supporting affidavit must provide the magistrate with
sufficient information to evaluate both aspects of the
probable-cause determination. See Garcia, supra, at 703.
In this case, the occurrence of the triggering condition—
successful delivery of the videotape to Grubbs’ residence—
would plainly establish probable cause for the search. In
addition, the affidavit established probable cause to be-
lieve the triggering condition would be satisfied. Although
it is possible that Grubbs could have refused delivery of
the videotape he had ordered, that was unlikely. The
Cite as: 547 U. S. ____ (2006) 7
Opinion of the Court
Magistrate therefore “had a ‘substantial basis for . . .
conclud[ing]’ that probable cause existed.” Gates, 462
U. S., at 238–239 (quoting Jones v. United States, 362 U. S.
257, 271 (1960)).
III
The Ninth Circuit invalidated the anticipatory search
warrant at issue here because the warrant failed to specify
the triggering condition. The Fourth Amendment’s par-
ticularity requirement, it held, “applies with full force to
the conditions precedent to an anticipatory search war-
rant.” 377 F. 3d, at 1077–1078.
The Fourth Amendment, however, does not set forth
some general “particularity requirement.” It specifies only
two matters that must be “particularly describ[ed]” in the
warrant: “the place to be searched” and “the persons or
things to be seized.” We have previously rejected efforts to
expand the scope of this provision to embrace unenumer-
ated matters. In Dalia v. United States, 441 U. S. 238
(1979), we considered an order authorizing the intercep-
tion of oral communications by means of a “bug” installed
by the police in the petitioner’s office. The petitioner
argued that, if a covert entry is necessary to install such a
listening device, the authorizing order must “explicitly set
forth its approval of such entries before the fact.” Id., at
255. This argument fell before the “ ‘precise and clear’ ”
words of the Fourth Amendment: “Nothing in the lan-
guage of the Constitution or in this Court’s decisions
interpreting that language suggests that, in addition to
the [requirements set forth in the text], search warrants
also must include a specification of the precise manner in
which they are to be executed.” Id., at 255 (quoting Stan-
ford v. Texas, 379 U. S. 476, 481 (1965)), 257. The language
of the Fourth Amendment is likewise decisive here; its
particularity requirement does not include the conditions
precedent to execution of the warrant.
8 UNITED STATES v. GRUBBS
Opinion of the Court
Respondent, drawing upon the Ninth Circuit’s analysis
below, relies primarily on two related policy rationales.
First, he argues, setting forth the triggering condition in
the warrant itself is necessary “to delineate the limits of
the executing officer’s power.” Brief for Respondent 20.
This is an application, respondent asserts, of the following
principle: “[I]f there is a precondition to the valid exercise
of executive power, that precondition must be particularly
identified on the face of the warrant.” Id., at 23. That
principle is not to be found in the Constitution. The
Fourth Amendment does not require that the warrant set
forth the magistrate’s basis for finding probable cause,
even though probable cause is the quintessential “precon-
dition to the valid exercise of executive power.” Much less
does it require description of a triggering condition.
Second, respondent argues that listing the triggering
condition in the warrant is necessary to “ ‘assur[e] the
individual whose property is searched or seized of the
lawful authority of the executing officer, his need to
search, and the limits of his power to search.’ ” Id., at 19
(quoting United States v. Chadwick, 433 U. S. 1, 9 (1977)).
The Ninth Circuit went even further, asserting that if the
property owner were not informed of the triggering condi-
tion, he “would ‘stand [no] real chance of policing the
officers’ conduct.’ ” 377 F. 3d, at 1079 (quoting Ramirez v.
Butte-Silver Bow County, 298 F. 3d 1022, 1027 (CA9
2002)). This argument assumes that the executing officer
must present the property owner with a copy of the war-
rant before conducting his search. See 377 F. 3d, at 1079,
n. 9. In fact, however, neither the Fourth Amendment nor
Rule 41 of the Federal Rules of Criminal Procedure im-
poses such a requirement. See Groh v. Ramirez, 540 U. S.
551, 562, n. 5 (2004). “The absence of a constitutional
requirement that the warrant be exhibited at the outset of
the search, or indeed until the search has ended, is . . .
evidence that the requirement of particular description
Cite as: 547 U. S. ____ (2006) 9
Opinion of the Court
does not protect an interest in monitoring searches.”
United States v. Stefonek, 179 F. 3d 1030, 1034 (CA7 1999)
(citations omitted). The Constitution protects property
owners not by giving them license to engage the police in a
debate over the basis for the warrant, but by interposing,
ex ante, the “deliberate, impartial judgment of a judicial
officer . . . between the citizen and the police.” Wong Sun
v. United States, 371 U. S. 471, 481–482 (1963), and by
providing, ex post, a right to suppress evidence improperly
obtained and a cause of action for damages.
* * *
Because the Fourth Amendment does not require that
the triggering condition for an anticipatory search warrant
be set forth in the warrant itself, the Court of Appeals
erred in invalidating the warrant at issue here. The
judgment of the Court of Appeals is reversed, and the case
is remanded for further proceedings consistent with this
opinion.
It is so ordered.
JUSTICE ALITO took no part in the consideration or
decision of this case.
Cite as: 547 U. S. ____ (2006) 1
Opinion of SOUTER, J.
SUPREME COURT OF THE UNITED STATES
_________________
No. 04–1414
_________________
UNITED STATES, PETITIONER v. JEFFREY GRUBBS
ON WRIT OF CERTIORARI TO THE UNITED STATES COURT OF
APPEALS FOR THE NINTH CIRCUIT
[March 21, 2006]
JUSTICE SOUTER, with whom JUSTICE STEVENS and
JUSTICE GINSBURG join, concurring in part and concurring
in the judgment.
I agree with the Court that anticipatory warrants are
constitutional for the reasons stated in Part II of the
Court’s opinion, and I join in the disposition of this case.
But I would qualify some points made in Part III.
The Court notes that a warrant’s failure to specify the
place to be searched and the objects sought violates an
express textual requirement of the Fourth Amendment,
whereas the text says nothing about a condition placed by
the issuing magistrate on the authorization to search
(here, delivery of the package of contraband). That textual
difference is, however, no authority for neglecting to spec-
ify the point or contingency intended by the magistrate to
trigger authorization, and the government should beware
of banking on the terms of a warrant without such specifi-
cation. The notation of a starting date was an established
feature even of the objectionable 18th-century writs of
assistance, see, e.g., Massachusetts Writs of Assistance
Bill, 1762, reprinted in M. Smith, The Writs of Assistance
Case 567–568 (1978); Writ of Assistance (English) of
George III, 1761, reprinted in id., at 524–527. And it is
fair to say that the very word “warrant” in the Fourth
Amendment means a statement of authority that sets out
the time at which (or, in the case of anticipatory warrants,
2 UNITED STATES v. GRUBBS
Opinion of SOUTER, J.
the condition on which) the authorization begins.*
An issuing magistrate’s failure to mention that condi-
tion can lead to several untoward consequences with
constitutional significance. To begin with, a warrant that
fails to tell the truth about what a magistrate authorized
cannot inform the police officer’s responsibility to respect
the limits of authorization, see Groh v. Ramirez, 540 U. S.
551, 560–563, 561, and n. 4 (2004), a failing assuming real
significance when the warrant is not executed by the
official who applied for it and happens to know the un-
stated condition. The peril is that if an officer simply
takes such a warrant on its face and makes the ostensibly
authorized search before the unstated condition has been
met, the search will be held unreasonable. It is true that
we have declined to apply the exclusionary rule when a
police officer reasonably relies on the product of a magis-
trate’s faulty judgment or sloppy practice, see Massachu-
setts v. Sheppard, 468 U. S. 981, 987–991 (1984). But when
a government officer obtains what the magistrate says is
an anticipatory warrant, he must know or should realize
when it omits the condition on which authorization de-
pends, and it is hard to see why the government should
not be held to the condition despite the unconditional face
of the warrant. Cf. Groh v. Ramirez, supra, at 554–555,
563, and n. 6 (declaring unconstitutional a search con-
ducted pursuant to a warrant failing to specify the items
the government asked the magistrate permission to seize
in part because “officers leading a search team must ‘make
sure that they have a proper warrant that in fact author-
izes the search and seizure they are about to conduct’ ”
(brackets omitted)).
Nor does an incomplete anticipatory warrant address an
——————
* Federal Rule of Criminal Procedure 41(e)(2)(A) in fact requires that
an issued warrant command the executing officer to “execute the
warrant within a specified time no longer than 10 days.”
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Opinion of SOUTER, J.
owner’s interest in an accurate statement of the govern-
ment’s authority to search property. To be sure, the ex-
tent of that interest is yet to be settled; in Groh v. Ramirez,
supra, the Court was careful to note that the right of an
owner to demand to see a copy of the warrant before mak-
ing way for the police had not been determined, id., at 562,
n. 5, and it remains undetermined today. But regardless
of any right on the owner’s part, showing an accurate
warrant reliably “assures the individual whose property is
searched or seized of the lawful authority of the executing
officer, his need to search, and the limits of his power to
search.” United States v. Chadwick, 433 U. S. 1, 9 (1977),
quoted in Groh v. Ramirez, supra, at 561. And if a later
case holds that the homeowner has a right to inspect the
warrant on request, a statement of the condition of au-
thorization would give the owner a right to correct any
misapprehension on the police’s part that the condition
had been met when in fact it had not been. If the police
were then to enter anyway without a reasonable (albeit
incorrect) justification, the search would certainly be open
to serious challenge as unreasonable within the meaning
of the Fourth Amendment.