The Supreme Court heard oral arguments on April 27, 2026, in Chatrie v. United States in a case that will define whether geofence warrants are constitutional. These warrants allow law enforcement to compel tech companies to hand over location data for all devices in a specific geographic area during a specific time window. A ruling is expected before the Court's term closes, likely by late June or early July 2026.

Geofence warrants work by casting what amounts to a digital dragnet. When investigators don't know who committed a crime, they can ask a judge to order a company like Google to reveal the location data of every device that was in the vicinity at the time of the offense. For police, this is valuable — it narrows the suspect pool. For privacy advocates, it's the constitutional problem: the warrant sweeps up innocent bystanders along with suspects.

The Fourth Amendment Question

The Fourth Amendment requires that warrants describe with specificity what is being searched for and who or what is being seized. The central question in Chatrie is whether a geofence warrant satisfies this requirement. By its nature, a geofence warrant targets a location, not a named suspect or a known device. Civil rights groups argue this makes it a "general warrant" — the kind of unrestricted search that the Framers wrote the Fourth Amendment to prohibit.

The Project for Privacy and Surveillance Accountability filed an amicus brief on March 2, 2026, taking the harder line: geofence warrants are general warrants that should be categorically forbidden, not just subject to stricter rules.

Professor Orin Kerr, a leading Fourth Amendment scholar, filed on the opposite side. His April 1, 2026 amicus brief argues that geofence warrants can be constitutional if they're drawn carefully enough to satisfy the specificity requirement. Kerr frames this as a question of calibration — whether a warrant is narrow and precise enough — rather than whether geofence warrants should exist at all. This position aligns with the government's stance and offers the Court a middle path: allow this warrant while laying out standards for future ones.

What the Amicus Filings Reveal

The range of organizations weighing in signals how consequential this case is. Google, which controls the Location History data at the center of Chatrie, filed its own amicus brief on March 1, 2026. Google's intervention matters because the company is the dominant custodian of the location data that makes geofence warrants workable in the first place. Google has a direct stake in what legal framework emerges. The brief covers both the constitutional question and the technical reality — how location data is collected, stored, and handed over — detail that may be essential for the Justices to judge whether a geofence request can ever be specific enough.

The Center for Democracy and Technology, filing February 27, 2026, raised a different concern: geofence warrants jeopardize the free exercise of foundational democratic activities — attending a protest, visiting a doctor, going to church — because individuals cannot know in advance that their location will be swept up in a criminal investigation simply because they happened to be nearby.

This argument builds on a precedent the Court set in Carpenter v. United States (2018), where Chief Justice Roberts held that long-term cell-site location data receives Fourth Amendment protection even when held by a third party. Chatrie asks whether that protection extends further — whether it constrains the warrant instrument itself, not just government access to data without a warrant.

What Comes Next

The practical consequences are real. Federal and state investigators have used geofence warrants in thousands of cases, including prosecutions of people involved in the January 6, 2021 Capitol breach. If the Court rules that geofence warrants are unconstitutional, law enforcement would lose a major investigative tool and prosecutors might need to revisit convictions that relied on such evidence. If the Court upholds them but imposes new restrictions, courts at the district level will have to litigate whether any particular warrant's geographic and temporal boundaries were sufficiently narrow.

The Court might also take a narrower path: rule only on the specific warrant in this case without settling the broader constitutional question. This would be a cautious approach, common when a case involves technical complexity and sharp disagreement among experts. Such a limited ruling would leave the legal framework uncertain and virtually guarantee more litigation down the road.

A decision is expected before the Court's term ends.