Geofence Warrants Challenge Supreme Court

Geofence warrants turn every phone into a potential suspect.

The fight over digital dragnet policing lands in the Supreme Court, as a coalition of civil-liberties groups argues that geofence warrants violate the Fourth Amendment. In a brief filed on Monday, the Electronic Frontier Foundation (EFF), the American Civil Liberties Union (ACLU), the ACLU of Virginia, and Georgetown Law’s Center on Privacy and Technology urge the justices to rule that geofence warrants are unconstitutional. These warrants compel tech companies to hand over data on every device in a defined geographic area during a specified window of time, without naming a suspect or even pointing to a particular person. The aim, critics say, is to map who was in the right place at the right time, not who committed a crime.

The case at the center is Chatrie v. United States, which the Court agreed to hear earlier this year. In the underlying scenario, police drew a radius around a Northern Virginia crime scene and sought data from Google for hundreds of millions of users to determine who might have been present. The brief contends that such “digital dragnet” requests sweep up innocent bystanders and violate protections designed to prevent exploratory rummaging through private lives. By compelling companies to disclose broad swaths of location history, the brief argues, geofence warrants bypass the particularity and individualized suspicion that undergird the Fourth Amendment.

Proponents of geofence warrants argue they are a targeted tool used to solve crimes, tapping into data that can narrow a suspect pool when traditional leads are scarce. But the brief emphasizes the risk that the same mechanism that helps authorities also creates an extraordinary privacy burden: millions of people who had no connection to the alleged crime could see their location data exposed in response to a broad, area-wide request. In a legal landscape where location data has become both highly informative and highly sensitive, the potential for overreach is at once technical and constitutional.

If the Court sides with the petitioners, the ruling could recalibrate how police access location data at scale and push courts to demand tighter limits, even the elimination, of blanket geofence approaches. Tech platforms would face renewed scrutiny over how they handle government data requests and over the ethical and legal liabilities of turning vast user datasets into policing tools. For law enforcement, the decision could force a shift toward more narrowly tailored evidence or alternative investigative methods, with a possible downstream impact on investigative procedures, data retention policies, and privacy protections that many platforms already build into product design.

What to watch next is not only the Court’s ruling but the reasoning that accompanies it. Expect questions about what constitutes sufficient particularity in the digital age and how to balance public safety against the privacy interests of bystanders. If the Court narrows or bans geofence warrants, the ruling could set a durable precedent for digital data requests that reach far beyond even location data, signaling that sweeping, non-targeted data pulls are out of bounds in modern policing.

Sources

EFF to Supreme Court: Shut Down Unconstitutional Geofence Searches