This is an interlocutory appeal from the district court’s suppression order brought pursuant to 18 U.S.C. § 3731. The government contends that the court (1) erroneously amended the search warrant’s date restriction; and (2) improperly excluded evidence seized under the plain view doctrine. We conclude that the original date restriction in the search warrant was supported by probable cause and that the court’s plain view doctrine analysis was in error. Accordingly, we reverse and remand for further proceedings.
I. BACKGROUND
This action arose from the government’s investigation of Defendanb-Appellee Fikri Soussi’s (“Soussi”) alleged role in the exportation of goods to Libya in violation of 50 U.S.C. §§ 1702 and 1705(b), the International Emergency Economic Powers Act. 2 Soussi is the president and sole shareholder of Oasis International, Inc., an export company incorporated in Colorado and located in Denver (“Oasis Denver”).
By affidavit filed on November 21, 1991, United States Customs Senior Special Agent James P. Roth (“Agent Roth”) alleged that Soussi engaged in a conspiracy to ship fifty camping trailers from the United States to Libya. Agent Roth’s affidavit describes an elaborate scheme involving Oasis Denver and two sister companies — Oasis International, Guernsey, United Kingdom (“Oasis Guernsey”) and Oasis International Oilfield, Abu Dhabi, United Arab Emirates (“Oasis Abu *567 Dhabi”). The scheme purportedly entailed the planned purchase of fifty trailers from a United States manufacturer and the subsequent shipment of these trailers from the United States to LaSpezia, Italy and ultimately to Benghazi, Libya. Three shipping companies were allegedly hired to transport the trailers during various legs of the journey, and Barclay’s Bank in Geneva, Switzerland allegedly issued a letter of credit to facilitate the transaction. Agent Roth testified that his information was gathered from a confidential informant as well as from U.S. Customs Agents’ discussions with the manufacturer of the trailers and the three shipping companies hired to ship the trailers.
On November 21, 1991, Magistrate Judge Donald E. Abram concluded that Agent Roth’s affidavit demonstrated probable cause to support a document search of Oasis Denver’s office pursuant to the following warrant:
Business records and documents, including correspondence, telephone messages, facsimile transmittals, purchase orders, invoices, sales records, payment records, contracts, customer information, product information, business contacts, business cards, address books, rolodex cards, and notes; shipping records, including orders, receipts, waybills, packing lists, correspondence with freight forwarders and shippers, and insurance documents; Customs records, including correspondence, regulations, applications, declarations, reports, and licenses; telephone records, including telephone numbers, toll call records, telexes, and facsimile transmittals; financial records, including checks, letters of credit, debits, receipts, payment records, bills, and account records; and similar docur ments, whether physical or electronic, relating to the sale, shipment, or exportation of trailers or other goods, directly or indirectly, to Libya during the time period of August 1, 1990 to the present.
Order of November 17, 1992 at 3 (emphasis added).
Accordingly, Agent Roth and several other agents executed the search warrant on November 21, 1991. During their five-hour search of Oasis Denver’s business office, the agents discovered between ten and fifteen thousand pages of documents, of which they seized approximately three hundred and fifty pages. The warrant did not incorporate Agent Roth’s affidavit, but Agent Roth testified at the suppression hearing that he summarized his affidavit for the other agents who participated in the search. Agent Roth made the final decision on site as to which documents to seize.
Following the execution of the warrant, the government obtained a two-count indictment, on February 28, 1992, charging Soussi with conspiracy to export goods to Libya in violation of 18 U.S.C. § 371; and aiding and abetting a transaction involving the export of goods to Libya in violation of 18 U.S.C. § 2 and 50 U.S.C. §§ 1702 & 1705(b). On May 29, 1992, Soussi filed a suppression motion, arguing that the government failed to establish probable cause to support the search warrant and that the warrant was facially overbroad. The district court conducted a suppression hearing on July 2, 1992 and issued an order on November 17, 1992 granting in part, and denying in part, Soussi’s motion to suppress.
The court first held that the government had established probable cause to support the search warrant for information relating to the export of fifty trailers to Libya. However, the court also concluded that the government lacked probable cause to search for information relating to the export of unspecified “other goods” because the government offered no information to suggest that Oasis International was illegally exporting any items other than the trailers.
Next, the court ruled that the government lacked probable cause to seize any documents dated prior to July 17,1991. Whereas the warrant authorized the seizure of documents dating back to August 1, 1990 (nine days prior to the date of Oasis Denver’s incorporation), the district court concluded that July 17, 1991 was the proper cutoff date because it was the first date known to the government on which Soussi contacted the manufacturer of the trailers. Thus, the court suppressed all documents dated between August 1, 1990 and July 17, 1991.
*568 Finally, the court rejected the government's reliance on the plain view doctrine to support its seizure of documents relating to "other goods" and those dated prior to July 17, 1991. In this regard, the court reasoned that the government may not "seize an item under the authority of an invalid portion of the warrant and later try to justify the seizure on the ground that the document came into plain view as they executed the warrant." Order of November 17, 1992 at 12. Because the search warrant contained both valid and invalid language, the court invoked the rule of partial suppression and suppressed those items seized under the invalid portion of the warrant. 3
In this appeal, the government challenges the court's treatment of the date restriction and the plain view doctrine analysis. We address these issues in turn. 4
II. DISCUSSION
In our review of the court's suppression order, we must accept its factual findings unless clearly erroneous and consider the evidence in the light most favorable to that order. United States v. Naugle,
A. Date Restriction
The government first contends that it had probable cause to seize documents dating back to August 1, 1990 because it believed that Soussi was engaged in a complex international business transaction involving multiple parties that necessarily preceded July 17, 1991, which was the date that the. court concluded was the first time that Soussi contacted the manufacturer of the trailers. 5 In rejecting the government's argument, the district court stated that any date earlier than July 17, 1991 would be arbitrary.
The Fourth Amendment requires that "no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized." U.S. Const. amend IV; United States v. Mesa-Rincon,
The task of the issuing magistrate is simply to make a practical, commonsense decision whether, given all the circumstances set forth in the affidavit before him there is a fair probability that contraband or evidence of a crime will be found in a particular place.
Id. at 238,
A reviewing court must give "great deference" to the magistrate's determination of probable cause and should uphold that conclusion if the "totality of the information
*569
contained in the affidavit provided a substantial basis for finding there was a fair proba-bifity that evidence of criminal activity would be found at" Oasis Denver's office. United States v. Hager,
We determine whether a search warrant's date restriction is supported by probable cause by examining the nature of the alleged illegal activity. Matter of Search of Kitty's East,
In Slocwin, the court held that the officers acted reasonably under an open-ended warrant in examining documents dated nearly two years prior to the earliest known date of a transaction relating to the conspiracy. As the Supreme Court explained in Andresen v. Maryland,
Agent Roth's investigation in the instant case led to the discovery of an alleged international conspiracy between Oasis Denver and two foreign corporations, and involving three shipping and freight forwarding corporations and a Swiss bank. Agent Roth's affidavit could not identify the precise date on which the alleged conspiracy commenced. Nonetheless, the nature of the alleged criminal activity required extensive planning and preparation, all carried out secretly. We conclude that documents dated during the ten months prior to the date Soussi first contacted the trailer manufacturer could reasonably provide a "substantial basis" under Gates for concluding that a crime had occurred as alleged. See Warden v. Hayden,
Accordingly, we reverse the district court's amendment to the date restriction in the search warrant and, uphold, as supported by probable cause, the original date restriction of August 1, 1990.
B. Plain View
The government next appeals the district court's rejection of its attempt to invoke the plain view doctrine to justify the seizure of documents relating to the export of trailers dated between August 1, 1990 and July 17, 1991, as well all documents not directly related to the exportation of trailers (i.e. the *570 documents relating to unspecified “other goods”). However, since we have upheld the earlier date of August 1,1990 as it appears in the warrant, the plain view doctrine is not needed to justify seizure of documents relating to the trailers going back to August 1, 1990. We therefore undertake the plain view doctrine analysis only for seized documents applying to the export of “other goods” 6 and any documents applying to the export of the trailers that may be dated prior to August 1, 1990. The district court concluded that the plain view exception to the warrant requirement does not allow for admission of such documents because plain view “may not be used to provide a secondary backup justification for items seized pursuant to an invalid part of the warrant.” Order of November 17, 1992 at 13.
We are mindful of the “grave dangers [to privacy interests] inherent in executing a warrant authorizing a search and seizure of a person’s papers ... [insofar as] some innocuous documents will be examined, at least cursorily, in order to determine whether they are, in fact, among those papers authorized to be seized.”
Andresen,
Accordingly, to prevent the plain view doctrine from eviscerating Fourth Amendment protections, the courts have required the government to satisfy a three-prong test: (1) the officer was lawfully in a position from which to view the object seized in plain view; (2) the object’s incriminating character was immediately apparent — i.e. the officer had probable cause to believe the object was contraband or evidence of a crime; and (3) the officer had a lawful right of access to the object itself.
Horton v. California,
Along with numerous other circuits, we have upheld the plain view seizure of documents even when the police only learned of the documents’ incriminating nature by perusing them during a lawful search for other objects.
See, e.g., United States v. Gentry,
Here, the district court rejected the government’s reliance on the plain view doctrine without considering whether the government met the three-prong test under Horton. In so doing, the court added a new gloss to the plain view test — namely, that the officer may not use the plain view doctrine to justify a seizure of items that were initially seized pursuant to an unconstitutional portion of an otherwise valid warrant. We are sympathetic to the court’s concern, and the admonition by the Coolidge plurality, that the plain view doctrine not be used to sanction a general search. However, the Supreme Court’s three-prong test adequately prevents such an occurrence by specifying the only circumstances in which the plain view doctrine applies.
*571
The district court justified its rule as protecting the Fourth Amendment’s particularity requirement and deterring general searches. The Fourth Amendment’s “prohibition against general searches and general warrants serves primarily as a protection against unjustified intrusions on privacy.”
Horton,
The fact that an officer is interested in an item of evidence and fully expects to find it in the course of a search should not invalidate its seizure if the search is confined in area and duration by the terms of a warrant or a valid exception to the warrant requirement. If the officer has knowledge approaching certainty that the item will be found, we see no reason why he or she would deliberately omit a particular description of the item to be seized from the application for a search warrant. Specification of the additional item could only permit the officer to expand the scope of the search. On the other hand, if he or she has a valid warrant to search for one item and merely a suspicion concerning the second, whether or not it amounts to probable cause, we fail to see why that suspicion should immunize the second item from seizure if it is found during a lawful search for the first.
Id.
at 138-39,
We see no principled rationale to amend this firmly established test so as to insulate from seizure clearly incriminating items found in plain view during a lawful search for other materials merely because such items were named explicitly in an invalid portion of a warrant. Given that the plain view doctrine permits the government to seize items that are not named in an invalid portion of a warrant — so long as the officer has not violated the Fourth Amendment in arriving at the site, the incriminating nature of the material was immediately apparent, and the search was confined to the area authorized by the valid portion of a warrant — the district court’s new restriction infuses an unwarranted restriction that is not supported by the principles that inform Fourth Amendment jurisprudence.
Indeed, three circuits have expressly stated that even if part of a warrant is invalid, the police may properly seize evidence in plain view that is listed in the invalid portion of the warrant, provided that the redacted warrant justifies police presence on the site.
United States v. George,
We implicitly accepted this rule in
United States v. Brown,
Today, we make explicit that which
Brown
presaged: items named in an impermissibly broad portion of a warrant may nevertheless be seized pursuant to the plain view doctrine so long as the government’s plain view seizure scrupulously adheres to the three-prong
Horton
test. Although the officers in
Brown
opted to obtain a new warrant authorizing the seizure of the contraband, satisfaction of the
Horton
test would have justified a war-rantless seizure of the items under the plain view doctrine.
See United States v. Naugle,
In the instant case, Agent Roth and the other U.S. Customs agents were lawfully on the premises of Oasis Denver’s office by virtue of the valid portion of the warrant authorizing the seizure of information relating to the alleged exportation of trailers to Libya.
Naugle,
What remains to be determined, however, is whether the government can satisfy the second prong of
Horton:
was the incriminating character of the documents seized under the plain view doctrine immediately apparent during the cursory review (i.e. did the agents have probable cause to believe that the items were evidence of a crime or illegal contraband,
Arizona v. Hicks,
III. CONCLUSION
We REVERSE the district court’s suppression order and REMAND for further proceedings.
Notes
. The International Emergency Economic Powers Act authorizes the President to "deal with any unusual and extraordinary threat, which has its source in whole or substantial part outside the United States, to the national security, foreign policy, or economy of the United States, if the President declares a national emergency with respect to such threat.” 50 U.S.C. § 1701(a). Pursuant to this authority, on January 7, 1986, the President issued Executive Order No. 12543 prohibiting, inter alia,
(b) The export to Libya of any goods, technology (including technical data or other information) or services from the United States, except publications and donations of articles intended to relieve human suffering, such as food, clothing, medicine and medical supplies intended strictly for medical purposes;
(h) Any transaction by any United States person which evades or avoids, or has the purpose of evading or avoiding, any of the prohibitions set forth in this Order.
Executive Order No. 12543 (January 7, 1986), codified in 31 C.F.R. § 550.101 et seq.
. Although at the time of the district court's suppression hearing we had not expressly adopted the rule that valid portions of a warrant may be severed from invalid portions, we have since done so in United States v. Brown,
. Because we conclude that the district court did not err in ruling that the search warrant did not constitute a general warrant, we reject Soussi's argument that the court's suppression order may be affirmed on the ground that the warrant authorized a general search. Nor do we agree with Soussi's allegation that the government's failure to include additional information in the warrant "invalidates the general description in the warrant." Even if the government possessed information that could have rendered the warrant more particular, it in no way undermines the court's conclusion that the warrant, as is, was sufficiently particular with respect to documents relating to the alleged export of the trailers.
. The court appears to have misread the affidavit, In fact, Agent Roth's affidavit indicates that the earliest known date on which Soussi contacted the trailer manufacturer was May 1991.
. The government did not appeal the district court's order restricting the warrant to the fifty trailers that were to be exported to Libya and excluding from the warrant the reference to "other goods.” Thus, in order to justify the seizure of any documents relating to “other goods” that may be exported to Libya, regardless of their date, the government must rely on the plain view doctrine.
