Supreme Court rules police need warrants for geofence location searches, tightening digital privacy protections

The Supreme Court on Monday handed down a significant ruling on digital privacy, holding that police must obtain a warrant before using so-called “geofence warrants” to sweep up cellphone location data from a broad area. The 6-3 decision, which split along ideological lines with three conservative justices dissenting, clarifies that such data collection constitutes a “search” under the Fourth Amendment, even when the information is held by third-party tech companies.

Writing for the majority, Justice Elena Kagan emphasized the foundational principle that the Fourth Amendment “must, as ever, protect against unjustified governmental intrusion on the privacy of the individual.” The ruling effectively closes a loophole that had allowed law enforcement to demand location records from companies like Google without meeting the traditional warrant standard — a practice that privacy advocates had long criticized as invasive and ripe for abuse.

The case stemmed from a 2018 bank robbery in Virginia. Police, after exhausting other leads, served Google with a geofence warrant that instructed the company to identify any users whose phones had pinged within a 300-meter radius of the bank during the time of the crime. The warrant swept in location data from millions of devices, ultimately narrowing the list to a handful of people, including Okello Chatrie. He was later convicted and sentenced to more than 11 years in prison.

Chatrie challenged the constitutionality of the warrant, arguing that it amounted to an unreasonably broad search — a “fishing expedition” lacking the particularity the Fourth Amendment demands. His lawyers warned that the technique could be misused to track attendees at churches, political rallies, or gun shops, calling the “potential for abuse breathtaking.”

In an unusual twist, the Supreme Court did not resolve Chatrie’s case directly. Because police in his case did, in fact, obtain a warrant — albeit a geofence one — the majority ruled only that such warrants are constitutionally required, then sent the matter back to lower courts to determine whether the specific search that identified Chatrie satisfied the amendment’s particularity requirement.

The ruling arrives at a moment when Americans store vast amounts of personal data on servers controlled by corporations, raising thorny questions about how the Fourth Amendment applies in the digital age. The decision builds on the Court’s 2018 precedent in Carpenter v. United States, which held that police generally need a warrant to access historical cell-site location data from phone towers. Monday’s decision extends that logic to far more precise GPS-level data, which can pinpoint a person’s location within three meters every two minutes.

Writing in dissent, Justice Samuel Alito derided the majority’s opinion as an “irresponsible escapade,” noting that it would send “seismic waves through our Fourth Amendment doctrine” while offering no relief to Chatrie himself. “The court knows this and does not claim otherwise,” Alito wrote, accusing the majority of “striking a pose as a great champion of privacy in the digital age.”

The Biden administration had defended the use of geofence warrants, arguing that users voluntarily share location data when they enable features like Google’s Location History. Chatrie, the government noted, “took no steps to protect his location from disclosure.” But the Court rejected that reasoning, siding with privacy advocates who say such consent is illusory in an era where smartphones constantly transmit location data to third parties.

Following the ruling, legal analysts expect police departments to adjust their investigative practices, likely relying more on traditional warrants based on individualized probable cause. Privacy experts said the decision could also prompt tech companies to further limit how they store and share location data. Google, which had received the majority of geofence warrants in recent years, had already revised its policy before the ruling.

In the immediate term, Chatrie’s case will return to the 4th US Circuit Court of Appeals, which must now determine whether the warrant used in his investigation was sufficiently particularized. If not, his conviction could be overturned — though the Supreme Court’s ruling does not guarantee that outcome.