Supreme Court Rules Geofence Warrants Are a Fourth Amendment Search in Landmark Privacy Case

On June 29, 2026, the U.S. Supreme Court handed down a 6-3 decision in Chatrie v. United States, ruling that law enforcement's use of "geofence warrants" to sweep up smartphone location data constitutes a search under the Fourth Amendment.[1][2]

The decision, authored by Justice Elena Kagan, marks a profound shift in how the Constitution applies to the digital age. It establishes that Americans do not surrender their constitutional privacy rights simply by carrying a smartphone that constantly pings cell towers and satellites.[1][4]

"An individual has a reasonable expectation of privacy in records about his cell phone's location," Kagan wrote for the majority, adding that police intrude on that protected interest when they demand the information from third-party tech companies.[1][5]

To understand the gravity of the ruling, one must understand the mechanism of a geofence warrant. Unlike a traditional search warrant—which targets a known suspect—a geofence warrant starts with a location and a timeframe, compelling tech companies to identify everyone who happened to be within that virtual perimeter.[4][6]

The Chatrie case originated from a May 2019 armed robbery of a federal credit union in Midlothian, Virginia, where a thief absconded with $195,000. With no initial suspects, local detectives turned to a novel digital dragnet.[7]

Investigators applied for a geofence warrant directing Google to identify all cell phones located within a 150-meter radius of the bank during a one-hour window surrounding the heist.[3][7]

The warrant utilized a controversial three-step protocol. First, Google provided anonymized location data for 19 devices present within the geofenced boundary.[7]

Second, law enforcement analyzed this anonymized data to track the movements of those devices, looking for patterns that matched the robbery. They then compelled Google to provide expanded location history for a narrower subset of those devices.[7]

In the final step, police forced Google to de-anonymize the targeted accounts, revealing the names and subscriber information of the users. One of those names was Okello Chatrie, whose device had entered the geofence roughly ten minutes before the robbery.[4][7]

Chatrie was subsequently convicted, but he appealed, arguing that the geofence warrant was an unconstitutional, warrantless search. The government countered that the search was limited—covering only a two-hour window—and relied on the "third-party doctrine," which traditionally holds that people have no privacy expectation in data they voluntarily hand over to companies.[1]

The Supreme Court firmly rejected the government's arguments. The majority opinion characterized the government's claim that users "voluntarily" generate location history as "meritless," noting that Google repeatedly prompts users to enable the feature and warns that apps may not function correctly without it.[1]

The Court leaned heavily on its landmark 2018 decision in Carpenter v. United States, which required police to get a warrant to access days of cell-site location information. The justices concluded that Google's Location History is even more precise and revealing than the cell tower data at issue in Carpenter.[4][5]

Even a brief window of highly accurate location data, the Court noted, can expose intimate details about an individual's movements, associations, and private life.[5][7]

However, the Supreme Court did not declare all geofence warrants categorically unconstitutional. Instead, it ruled that they are Fourth Amendment searches that must meet constitutional standards of probable cause and particularity.[4][5]

The justices remanded Chatrie's specific case back to the 4th U.S. Circuit Court of Appeals to determine whether the unique three-step warrant used by Virginia police was sufficiently narrow and supported by probable cause.[2][5]

The ruling leaves open significant questions for lower courts, specifically regarding how large a geofence can be and how long a time interval is permissible before a warrant becomes an unconstitutional "general warrant."[3][6]

The tech industry is already adapting. Anticipating legal challenges, Google recently altered how it stores location data, moving it from centralized company servers directly onto users' individual devices. This architectural shift means Google can no longer comply with the type of dragnet search performed in Chatrie.[4][6]

Yet the Supreme Court's ruling remains highly consequential. Other technology companies, including Apple, Uber, Snapchat, and various telecom providers, still retain vast troves of centralized location data that law enforcement routinely seeks.[5][6]

By establishing a firm constitutional boundary, the Court has ensured that as surveillance technology grows more sophisticated, the Fourth Amendment will evolve alongside it to protect the digital trails of everyday citizens.[1][4]