United States v. Alisigwe
The Second Circuit held that a manual search of a traveler’s cellphone at the international border is a routine border search requiring no warrant, probable cause, or reasonable suspicion, while expressly leaving more sophisticated forensic searches unresolved.
Executive Summary
United States v. Alisigwe is a major Second Circuit decision on digital-device searches at the international border. The court held that a manual cellphone search is a routine search of property under the border-search exception and therefore may be conducted without a warrant, probable cause, or reasonable suspicion.
Chinwendu Alisigwe, a lawful permanent resident, was stopped at John F. Kennedy International Airport in 2019 and again in 2021. On both occasions, officers manually reviewed the contents of his cellphone by scrolling through the device and photographing information they observed. The searches produced evidence later used in a federal fraud prosecution.
The district court denied suppression after concluding that cellphone searches at the border required reasonable suspicion but finding reasonable suspicion on both occasions. The Second Circuit affirmed on broader grounds: it held that reasonable suspicion was unnecessary because manual cellphone searches are routine border searches.
Within the Second Circuit, a manual search of a traveler’s cellphone at the international border may be conducted without a warrant, probable cause, or reasonable suspicion. The court also rejected an independent First Amendment warrant requirement.
Alisigwe involved manual review of a cellphone. The court expressly declined to decide whether sophisticated forensic methods, off-site analysis, or comparable data-extraction techniques might qualify as nonroutine searches requiring reasonable suspicion.
Background
Federal investigators suspected Alisigwe of using fraudulent passports and identification documents to open bank accounts in the identities of real people. Between 2017 and 2020, he opened numerous accounts, moved fraud proceeds through those accounts, and transferred funds domestically and abroad.
The investigation intensified after authorities in the United Kingdom seized a fraudulent South African passport containing a photograph that facial-recognition software associated with Alisigwe. Homeland Security Investigations opened a criminal investigation in coordination with other federal and international authorities.
Alisigwe later went to trial in the Southern District of New York and was convicted of conspiracy to commit bank fraud, bank fraud, and conspiracy to commit money laundering. His appeal challenged, among other things, the denial of his motion to suppress evidence obtained during the two airport cellphone searches.
The Two JFK Cellphone Searches
2019 search
After Alisigwe returned to the United States from Nigeria, HSI and Customs and Border Protection officers stopped him at JFK for secondary inspection. An officer directed him to unlock his cellphone. The officer manually scrolled through the phone and used another cellphone to photograph information displayed in Alisigwe’s photo gallery.
The gallery contained images reflecting names, birthdates, Social Security numbers, bank-account information, and addresses associated with other individuals. Investigators linked that information to accounts opened during the suspected fraud scheme.
2021 search
Two years later, officers again stopped Alisigwe at JFK. An officer manually reviewed the phone and photographed a WhatsApp message that investigators viewed as evidence connecting Alisigwe to the misuse of another person’s identity.
Both searches were manual reviews. The record did not present a forensic extraction, off-site forensic examination, or comparable sophisticated data-recovery process for the Second Circuit to decide.
The Fourth Amendment Holding
The Second Circuit began with the longstanding border-search doctrine. Searches at the international border are treated differently from ordinary domestic searches because the government has its strongest sovereign interest there in controlling who and what enters the country.
Second Circuit precedent had already distinguished routine border searches from more intrusive, nonroutine searches. Routine searches of property generally require no individualized suspicion, while highly intrusive searches of the person may require reasonable suspicion.
The majority classified a cellphone as property and concluded that a manual search of its contents falls within the routine-search category. On that basis, the court held that officers did not need reasonable suspicion before manually searching Alisigwe’s cellphone.
The majority treated the border-search exception as broader than a contraband-only rule. The validity of the search did not depend on whether officers were motivated by a separate criminal investigation or were searching only for evidence of a traditional border offense.
The court therefore affirmed the denial of suppression even though it disagreed with the district court’s conclusion that reasonable suspicion was required.
Why Riley v. California Did Not Control
Alisigwe relied heavily on Riley v. California, where the Supreme Court held that police generally need a warrant to search digital information on a cellphone seized incident to arrest. The Second Circuit declined to extend Riley to the border-search context.
The majority emphasized that Riley involved a different exception to the warrant requirement. Search incident to arrest is justified primarily by officer safety and preservation of evidence. The border-search exception rests on the sovereign power to regulate entry into the United States.
Because those doctrines serve different governmental interests, the court concluded that Riley did not create a warrant requirement for cellphone searches at the border.
The privacy characteristics of a cellphone do not automatically produce the same constitutional rule across different Fourth Amendment exceptions. Agencies must identify the specific exception authorizing the search rather than applying Riley as a universal cellphone-search rule.
The First Amendment Argument
Amici argued that cellphone searches at the border implicate speech, association, press activity, confidential sources, and other expressive interests because modern devices contain enormous quantities of expressive and associational information.
The majority rejected the argument that the First Amendment creates a separate warrant requirement. It reasoned that challenges to the reasonableness of government searches ordinarily arise under the Fourth Amendment and that expressive material does not receive a different probable-cause or warrant standard merely because of its communicative character.
The court also viewed a cellphone-specific First Amendment warrant rule as overinclusive and underinclusive: it would specially protect expressive material stored digitally while leaving comparable expressive material in notebooks, diaries, pamphlets, photographs, or other physical media subject to ordinary border-search rules.
The majority rejected an independent First Amendment warrant rule. That does not mean that every border-search policy or search decision affecting speech, press, religion, or association is immune from separate constitutional challenge under all circumstances.
Judge Lee’s Concurrence in the Judgment
Judge Eunice C. Lee agreed with the judgment because Alisigwe argued that the searches required a warrant and probable cause. She agreed that neither a warrant nor probable cause was necessary at the border.
She disagreed, however, with the majority’s broader conclusion that cellphone searches should categorically be treated as routine and therefore require no individualized suspicion. In her view, modern cellphones are qualitatively different from luggage, wallets, or other traditional property because they expose vast amounts of highly personal information.
Judge Lee emphasized that the appeal did not require the panel to decide whether reasonable suspicion was necessary. The district court had found reasonable suspicion, and Alisigwe did not challenge that finding on appeal. She therefore would have affirmed without deciding the broader suspicionless-search question.
Judge Lee also would not have reached the independent First Amendment theory because Alisigwe did not present that argument as a ground for reversal; it was advanced by amici.
The concurrence highlights the unresolved tension between traditional border-search doctrine and the extraordinary quantity and sensitivity of information accessible through modern digital devices. That debate is likely to remain important as courts confront forensic extraction, cloud-access issues, and more intrusive search methods.
What Alisigwe Does—and Does Not—Establish
- The decision governs the Second Circuit and is not a Supreme Court decision.
- The holding concerns manual cellphone searches at the international border or its functional equivalent.
- The court did not decide whether sophisticated forensic searches, off-site analysis, or comparable extraction techniques require reasonable suspicion.
- The case does not overrule Riley v. California; it holds that Riley addressed a different Fourth Amendment exception.
- The majority rejected a separate First Amendment warrant requirement, but other constitutional challenges may depend on different facts and theories.
- The district court had found reasonable suspicion for both searches, but the majority held that reasonable suspicion was unnecessary for the manual searches before it.
- Agency policy may impose stricter requirements than the constitutional minimum.
- Searches of cloud-based material, remote data, privileged communications, or enterprise-managed devices can raise additional legal, policy, and evidentiary issues not resolved by this opinion.
Agency Guidance
Primary Sources and Further Reading
This monograph is provided for training and general informational purposes. It is not legal advice and does not replace review of the complete opinion, current statutes, controlling federal and state authority, agency policy, technical documentation, or consultation with prosecutors and agency counsel.
© 2026 Shield Public Safety Training. All rights reserved. Reviewed September 19, 2026.