The U.S. Court of Appeals for the Fourth Circuit ruled in U.S. v. Belmonte Cardozo that border officers can conduct warrantless, suspicionless manual searches of cell phones, drawing a sharp legal line between quick hand-held checks and deep forensic extractions. According to court records, the decision stems from a challenge brought by the Electronic Frontier Foundation (EFF), the American Civil Liberties Union (ACLU), and the National Association of Criminal Defense Lawyers (NACDL), who filed an amicus brief arguing that all electronic device searches at the border require a warrant based on probable cause.
The Fourth Circuit Ruling in U.S. v. Belmonte Cardozo
According to the Fourth Circuit’s opinion, the case involved Jose Belmonte Cardozo, a traveler arriving from Bolivia who was met by a U.S. Customs and Border Protection (CBP) officer at Washington Dulles International Airport. The border officer manually searched Belmonte Cardozo’s cell phone and discovered child sexual abuse material, leading to his federal criminal prosecution. On appeal, the defense contested the constitutionality of the warrantless search. The court held that manual cell phone searches qualify as “routine” border searches, exempting them from the warrant and individualized suspicion requirements that govern more invasive techniques.
The court based its distinction on four operational differences between manual checks and forensic extractions. First, manual searches are conducted directly by human agents using a device’s native interface, whereas forensic searches rely on specialized external software. Second, the breadth of a manual search is constrained by an officer’s available time and energy. Third, manual searches typically surface only data immediately accessible to a casual user, while forensic tools extract deleted files, cached fragments, and hidden metadata. Fourth, manual searches leave behind only an officer’s memory and notes, whereas forensic tools generate permanent digital copies of a device’s complete contents.
Weighing Privacy Protections Against Border Search Exceptions
The Fourth Amendment generally mandates that government searches of personal property require a warrant supported by probable cause. However, the long-standing border search exception permits warrantless searches of individuals and belongings crossing into the United States to protect national security and control the entry of contraband. In Riley v. Supreme Court recognized that modern cell phones hold vast quantities of deeply personal data—including private communications, and more—that bear little resemblance to physical luggage or containers.
Building on Riley, the Fourth Circuit previously established stringent limits on digital privacy in cases involving forensic extraction software. According to U.S. v. Kolsuz (2018), forensic phone searches at the border are nonroutine and require individualized suspicion of a transnational offense. Furthermore, in U.S. v. Aigbekaen (2019), the court ruled that forensic searches supporting purely domestic investigations require a warrant. Despite those precedents, the court in Belmonte Cardozo declined to extend similar protections to manual checks, emphasizing that the search in question lasted only two minutes.
Legal Fallout and Future Border Privacy Standards
Civil liberties organizations have criticized the ruling for ignoring the reality of modern smartphone architecture. According to the EFF’s amicus filings, a manual search can access the same sensitive categories of personal data as a forensic extraction, particularly as device operating systems incorporate powerful native keyword search functions that can locate private photos and messages in seconds. Privacy advocates argue that an individual’s constitutional rights should not depend on whether a border agent scrolls through a device manually or connects a data cable.
The ruling leaves a narrow opening for travelers within the Fourth Circuit’s jurisdiction, which covers Maryland, North Carolina, South Carolina, Virginia, and West Virginia. By tying its reasoning to the brief two-minute duration of the search, the court suggested that significantly longer manual examinations might trigger heightened suspicion thresholds. Until appellate courts or Congress establish a uniform statutory standard, border agents retain broad authority to inspect the contents of travelers’ personal electronics without judicial oversight.