For years, American police have operated a quiet inversion of constitutional logic: instead of identifying a suspect and then gathering evidence, they gathered everyone's evidence and then identified suspects. The Supreme Court has now declared this backwards, ruling that geofence warrants—demands that tech companies hand over location data for every device in a given area during a given time—are searches that require probable cause under the Fourth Amendment.
The decision marks the most significant expansion of digital privacy rights since Carpenter v. United States in 2018, which required warrants for historical cell-site location data. But where Carpenter addressed targeted surveillance of known individuals, this ruling confronts something more troubling: the surveillance of everyone, on the theory that someone in the crowd might be guilty.
How geofence warrants actually work
The mechanics are deceptively simple. Police draw a virtual boundary around a crime scene—a bank, a protest, a neighborhood—and demand that Google, Apple, or other companies identify every device that passed through during a specified window. The initial data is supposedly anonymized, but investigators can then request identifying information for devices that look suspicious.
The problem, which the Court's majority opinion addressed directly, is that this process inverts the traditional warrant requirement. Instead of demonstrating probable cause that a specific person committed a crime, police demonstrate only that a crime occurred somewhere, and that phones existed nearby. The warrant becomes a fishing expedition dressed in legal clothing.
Google alone reported receiving tens of thousands of geofence requests annually before beginning to phase out the practice. The warrants swept up protesters, churchgoers, passersby, and delivery drivers alongside any actual suspects. In one notorious case, a man was wrongly arrested for murder after his fitness app placed him near the scene during a bike ride.
The Court's reasoning
The majority opinion, spanning the Court's usual ideological divisions, grounded its reasoning in the Fourth Amendment's particularity requirement. A valid warrant must describe "the place to be searched, and the persons or things to be seized." Geofence warrants, the Court found, describe neither—they describe a geographic container and demand everything inside it.
The ruling does not eliminate location-based evidence gathering entirely. Police can still obtain traditional warrants for specific suspects' location histories. They can subpoena records with appropriate judicial oversight. What they cannot do is treat an entire neighborhood's movements as a searchable database simply because a crime occurred nearby.
Critics, including the dissenting justices, argued the ruling will hamper investigations of serious crimes where witnesses are scarce and traditional leads exhausted. Supporters counter that constitutional rights exist precisely to constrain efficient policing—that the Bill of Rights is not an optimization problem.
Our take
The geofence warrant was always a constitutional absurdity masquerading as technological inevitability. The fact that phones can be tracked does not mean they must be, and the fact that tracking is easy does not make it legal. The Court has now stated the obvious: that "I was nearby" is not probable cause, and that the government cannot conscript every smartphone into an involuntary witness. This is not a radical expansion of privacy rights. It is a belated recognition that the Fourth Amendment applies to the twenty-first century.
