Does the 4th Amendment Protect Your Smartphone Tracking Data?

The U.S. Supreme Court heard oral arguments on April 19, 2026, in a case examining whether law enforcement’s use of geofence warrants to access smartphone location data violates the Fourth Amendment’s protection against unreasonable searches and seizures.

The case, Okello v. United States, centers on a murder investigation in which police used a geofence warrant to obtain precise location data from Google, identifying devices near the scene of a 2023 robbery-turned-homicide. Investigators later narrowed the data to suspect Okello Chatrie, who was charged based in part on this digital evidence.

Geofence warrants, also known as reverse location warrants, allow authorities to request data from tech companies about all devices within a specified geographic area during a set time period. Critics argue these warrants function as digital dragnets, sweeping up location information from hundreds or thousands of innocent individuals not suspected of any crime.

During the arguments, several justices expressed concern about the broad scope of such warrants. Justice Sonia Sotomayor questioned whether the practice amounted to a general warrant, which the Fourth Amendment was specifically designed to prohibit. “We are talking about the ability of the government to track the movements of every person in a city block for an hour,” she said. “That is not a particularized suspicion. That is a dragnet.”

Deputy Solicitor General Eric Feigin, representing the federal government, defended the use of geofence warrants as a vital tool in solving serious crimes, particularly when traditional investigative leads are absent. He emphasized that the warrants are subject to judicial oversight and that police must demonstrate a sufficient connection between the crime and the geographic area before a judge approves the request.

Google, which receives thousands of such requests annually, has increasingly pushed back on the practice. In 2023, the company reported receiving over 11,000 geofence warrants in the United States, a number that has risen steadily since 2018. The company has implemented internal review procedures to challenge overly broad requests and has advocated for clearer legal standards.

Lower courts have issued conflicting rulings on the constitutionality of geofence warrants. The U.S. Court of Appeals for the Fourth Circuit upheld their use in a 2024 decision, arguing that users implicitly assume the risk of location data collection when they use smartphones. In contrast, a federal district court in Illinois suppressed evidence obtained via a geofence warrant in 2025, citing insufficient particularity and the potential for indiscriminate surveillance.

The Supreme Court’s decision, expected by late June 2026, could establish a national precedent on how the Fourth Amendment applies to modern digital surveillance techniques. A ruling limiting or banning geofence warrants would significantly alter investigative practices for law enforcement agencies across the country, particularly in cases involving violent crimes where digital evidence plays a growing role.

Privacy advocates warn that without clear constitutional boundaries, emerging technologies could enable pervasive government tracking under the guise of public safety. Conversely, law enforcement officials maintain that tools like geofence warrants are essential for solving crimes in an era when perpetrators increasingly leave digital footprints rather than physical ones.