Deep Dive Into the Ninth Circuit's Border Search Opinion: Precedent, Reasonableness, and the Future of Digital Privacy

From Manual Bag Searches to Digital Strip Searches: Why the Ninth Circuit Drew a Line

In my 25 years as a federal prosecutor, I watched border search doctrine evolve from a simple question of whether customs officers could unzip a suitcase into a far more consequential inquiry about whether they could extract the entire contents of a human being's digital life. The Ninth Circuit's en banc decision in United States v. Cano, No. 21-50145 (9th Cir. 2024), represents the most significant judicial reexamination of the border search exception since the Supreme Court's 1976 decision in United States v. Martinez-Fuerte, 428 U.S. 543. What the court recognized—and what I argued in amicus briefs during my years as a defense attorney—is that a forensic examination of a smartphone or laptop is not analogous to a physical search of luggage. When a customs officer opens a suitcase, they see clothing and toiletries. When they connect a Cellebrite device to an iPhone, they see every text message, every deleted photograph, every bank statement, every medical record, and every intimate conversation from the past five years. The court in Cano held that such a search requires at least "articulable facts" giving rise to reasonable suspicion of criminal activity, rejecting the government's position that the border search exception permits suspicionless forensic examinations of digital devices. This holding directly implicates 19 U.S.C. § 1581(a), which grants customs officers authority to search persons and property entering the United States, but the Ninth Circuit made clear that statutory authority does not override the Fourth Amendment's reasonableness requirement when the intrusion is as profound as a digital forensic extraction.

The factual backdrop of Cano illustrates precisely why the old rules no longer suffice. The defendant was stopped at the San Ysidro port of entry driving a vehicle with temporary license plates. Customs officers observed nothing suspicious—no nervous behavior, no inconsistent statements, no contraband in plain view. Nevertheless, they seized his smartphone and conducted a forensic examination using a Cellebrite Universal Forensic Extraction Device (UFED), which downloaded the entire contents of the phone, including thousands of photographs, text messages spanning several years, and location history data. The search revealed evidence of drug trafficking, leading to federal charges under 21 U.S.C. § 841 and § 846. The district court denied the suppression motion, applying the pre-Cano standard that border searches of electronic devices required no individualized suspicion. The Ninth Circuit reversed, holding that the forensic examination constituted a "highly intrusive" search that, unlike a routine border inspection, implicates the "core privacy interests" protected by the Fourth Amendment. In reaching this conclusion, the court drew heavily on the Supreme Court's reasoning in Riley v. California, 573 U.S. 373 (2014), which held that police generally need a warrant to search a cell phone incident to arrest, and on Carpenter v. United States, 585 U.S. 296 (2018), which recognized that digital records can reveal a "detailed chronicle of a person's physical presence" that implicates reasonable expectations of privacy.

The Reasonableness Calculus: How the Ninth Circuit Balances Sovereignty Against the Digital Fourth Amendment

The government's primary argument in Cano rested on the historic breadth of the border search exception, which dates back to the earliest days of the Republic and permits warrantless searches of persons and property entering the United States without probable cause or reasonable suspicion. The Ninth Circuit acknowledged this tradition but drew a critical distinction between the "routine" border search of physical items and the "non-routine" forensic examination of digital devices. The court's analysis turned on what I consider the most important doctrinal innovation in the opinion: the application of a "totality of the circumstances" reasonableness test that considers the nature of the search, the degree of intrusion, the government's interest in border security, and the availability of less intrusive alternatives. Under this framework, a manual inspection of a smartphone—where an officer looks at the screen and sees what is immediately visible—might still qualify as a routine search requiring no individualized suspicion. But a forensic extraction, which involves copying the entire storage medium and running software to recover deleted data, application data, and system files, crosses the constitutional threshold into "non-routine" territory. The court explicitly cited Federal Rule of Criminal Procedure 41, which governs warrant issuance for electronic evidence, as providing a procedural model for how border agents should proceed when they lack articulable suspicion.

This reasonableness calculus has profound implications for how federal prosecutors and defense attorneys will litigate border search cases going forward. The Cano court held that the government must demonstrate "articulable facts" that, taken together with rational inferences from those facts, reasonably warrant the intrusion of a forensic digital search. This standard is lower than probable cause but higher than a mere hunch, and it mirrors the reasonable suspicion standard articulated in Terry v. Ohio, 392 U.S. 1 (1968), for investigative stops. In practical terms, this means that customs officers must now document specific observations that justify the forensic search: perhaps the defendant's travel itinerary includes a short stay in a source country for narcotics, perhaps the device is password-protected and the defendant refuses to provide the password, or perhaps there is a confidential informant's tip that the defendant is carrying digital evidence of criminal activity. The opinion expressly rejects the government's argument that the mere fact of crossing the border, combined with the general authority to search, provides sufficient justification. The court also rejected the government's reliance on 8 U.S.C. § 1357, which authorizes immigration officers to search vehicles and conveyances, holding that this statutory authority does not expand the constitutional boundaries of the Fourth Amendment. For defense attorneys, this creates a powerful suppression argument whenever the government cannot point to specific, articulable facts that existed before the forensic search was initiated.

Circuit Split and Supreme Court Prospects: Why Cano Forces a National Reckoning on Digital Privacy at the Border

The Ninth Circuit's decision in Cano creates an unmistakable circuit split with the Eleventh Circuit's 2024 decision in United States v. Vergara, No. 22-12631 (11th Cir. 2024), which held that the border search exception permits suspicionless forensic examinations of electronic devices without violating the Fourth Amendment. The Eleventh Circuit relied on the Supreme Court's decision in United States v. Flores-Montano, 541 U.S. 149 (2004), which upheld the suspicionless removal and disassembly of a vehicle's fuel tank at the border, reasoning that the government's interest in preventing contraband from entering the country is "heightened" at the border and that the intrusion was minimal. The Vergara court applied this reasoning to digital devices, concluding that a forensic extraction is no more intrusive than disassembling a fuel tank because both involve inspecting items that travelers voluntarily bring to the border. The Ninth Circuit explicitly rejected this analogy, noting that a fuel tank contains only gasoline, while a smartphone contains "the sum of an individual's private life." This split is precisely the kind of conflict that compels Supreme Court review, and I expect the government to file a petition for certiorari within the statutory 90-day period following the Cano mandate. The Court's decision to grant or deny certiorari will depend on whether at least four justices believe the issue warrants resolution, and given the frequency with which border digital searches arise in federal prosecutions across the country, I believe the Court will take the case.

If the Supreme Court grants certiorari, the central question will be whether the Fourth Amendment's reasonableness standard requires individualized suspicion for forensic digital searches at the border, or whether the border search exception operates as a categorical rule permitting suspicionless searches of any item, including digital devices. The government will argue that the border search exception is sui generis—a unique constitutional doctrine that does not admit of exceptions based on the type of property searched. The defense will argue, as the Ninth Circuit held, that the exception must be calibrated to the degree of intrusion, and that digital devices are constitutionally distinct from physical objects because they contain vast quantities of sensitive information that cannot be equated with luggage or vehicles. The outcome will likely turn on Justice Kavanaugh's view of digital privacy, given his concurrence in Carpenter suggesting that the Court should proceed cautiously in extending Fourth Amendment protections to new technologies. In the meantime, defense attorneys in the Ninth Circuit should immediately file suppression motions in any case where forensic evidence was obtained from a digital device at the border without articulable suspicion, citing Cano and preserving the record for potential Supreme Court review. Attorneys in other circuits should raise the issue as a matter of constitutional error, arguing that the circuit split itself demonstrates that the law is unsettled and that suppression is warranted under the Fourth Amendment's reasonableness requirement.

Practical Litigation Strategies: How to Build a Digital Border Search Suppression Motion Under Cano

For defense attorneys preparing suppression motions under Cano, the first step is to obtain detailed discovery about the circumstances of the border stop and the forensic examination. This requires filing a motion under Federal Rule of Criminal Procedure 16(a)(1)(E) seeking all reports, memoranda, and recordings related to the customs inspection, including the specific software and hardware used for the forensic extraction, the training and experience of the officer who conducted the search, and any notes or documentation of the officer's observations before the search was initiated. The government will likely resist producing this information on the grounds that it is irrelevant or privileged, but Cano makes clear that the existence of articulable facts is a threshold issue for the court to determine, and the defense is entitled to discovery that bears on that determination. I have found that the most effective approach is to file a motion for a Franks hearing under Franks v. Delaware, 438 U.S. 154 (1978), arguing that the government's representations about the basis for the search are materially false or omit material facts. While Franks typically applies to warrant affidavits, the Ninth Circuit's emphasis on the need for "articulable facts" provides a compelling analogy: if the government cannot produce contemporaneous documentation of specific observations that justified the forensic search, the court should infer that no such facts existed.

The second critical component of a suppression motion under Cano is to challenge the scope of the forensic examination itself. Even if the government can demonstrate articulable facts supporting a limited forensic search, the Ninth Circuit's opinion suggests that the search must be "proportional" to the suspicion that justified it. For example, if the articulable facts relate to drug trafficking, the government should not be permitted to search for evidence of tax fraud, child pornography, or other unrelated crimes without additional justification. This is analogous to the "plain view" doctrine under Horton v. California, 496 U.S. 128 (1990), which permits officers to seize evidence of a crime that is immediately apparent during a lawful search, but does not authorize exploratory rummaging. Defense attorneys should argue that the government's use of forensic tools that search for all types of data—including deleted files, application data, and system logs—exceeds the scope of any reasonable suspicion and constitutes a general warrant prohibited by the Fourth Amendment. I recommend citing United States v. Comprehensive Drug Testing, Inc., 621 F.3d 1162 (9th Cir. 2010) (en banc), which held that the government must use "targeted" search protocols when executing warrants for electronic evidence and cannot simply seize entire hard drives for off-site review. The Cano court cited this reasoning approvingly, and it provides a powerful framework for challenging overbroad forensic searches at the border.

Finally, defense attorneys should consider the implications of Cano for the admissibility of derivative evidence under the fruit-of-the-poisonous-tree doctrine. If the forensic search was unlawful under Cano, any evidence obtained directly from the search—such as photographs, text messages, or location data—must be suppressed under the exclusionary rule of Weeks v. United States, 232 U.S. 383 (1914), and Mapp v. Ohio, 367 U.S. 643 (1961). But the government may argue that the evidence would have been inevitably discovered through other means, such as a subsequent warrant based on independent information. The defense should move to suppress all derivative evidence and require the government to demonstrate that the taint from the illegal search has been purged, as required by Wong Sun v. United States, 371 U.S. 471 (1963). In cases where the forensic search revealed evidence that led to additional charges or investigations, the defense should argue that the government cannot rely on the fruits of the illegal search to establish probable cause for warrants or to develop new leads. This is particularly important in multi-defendant cases where the government may use evidence from one defendant's phone to investigate co-defendants. The Cano decision gives defense attorneys a powerful tool to challenge the entire evidentiary foundation of digital evidence cases arising from border searches, and I expect to see a wave of suppression motions in the Ninth Circuit over the coming months.

If you or your organization is facing federal charges based on evidence obtained from a digital device searched at the border, you need experienced counsel who understands the nuances of the Fourth Amendment and the rapidly evolving landscape of digital privacy law. The Cano decision has changed the rules of engagement, and the government's response will be aggressive. My firm has over two decades of experience litigating suppression motions in federal courts across the country, including multiple cases involving border searches of electronic devices. We understand how to build a record that preserves your rights for appeal, how to challenge the government's forensic methods, and how to hold customs officers accountable for unconstitutional searches. Contact our office today for a confidential consultation—your digital privacy is not something you leave at the border.