US Governance — 2026-06-29

Supreme Court Rules Geofence Warrants Constitute Fourth Amendment Search in Landmark Chatrie Decision

BLUFKagan's rejection of the third-party doctrine for passively collected location data extends well beyond geofence warrants, exposing the commercial data aggregator pipelines law enforcement has used to bypass warrant requirements.

The Supreme Court ruled 6-3 on Monday that law enforcement's use of a geofence warrant in the Chatrie bank robbery case constituted a Fourth Amendment search 12. Justice Kagan's majority held that individuals retain a reasonable expectation of privacy in cell phone location records held by third parties and rejected application of the third-party doctrine to passively collected location data 13. The Court stopped short of banning geofence warrants and remanded to the Fourth Circuit to assess whether the warrant, which directed Google to supply records for 19 accounts within 150 meters of the bank, satisfied Fourth Amendment reasonableness 14. Justice Alito, joined in part by Thomas and Barrett, dissented, warning the ruling "will send seismic waves through our Fourth Amendment doctrine" 1.

Analysis
The decision obligates DOJ and state-and-local law enforcement to restructure geofence warrant applications around probable cause and particularity. By rejecting the third-party doctrine for passively collected location data, the majority extends Carpenter beyond cell-site records and opens doctrinal ground for downstream challenges to commercial aggregator pipelines the FBI has used as a warrant-free alternative. That reach exceeds what April oral-argument coverage anticipated, when the government's narrow framing appeared to cabin the holding. Near-term enforcement consequences hinge on the Fourth Circuit remand, where the Chatrie warrant's reasonableness on the factual record below could yield a narrow compliance template limiting operational disruption. Moderate confidence in the ruling's doctrinal scope rests on the majority's breadth and the explicit rejection of the third-party doctrine.

4 sources

Court rules that law enforcement use of geofence warrant was a search - SCOTUSblog
Chatrie v. United States, No. 25-112 - Supreme Court of the United States
In major privacy win, Supreme Court rules geofence warrants are protected by privacy rights - TechCrunch
Supreme Court sends geofence warrant case back to lower court - The Hill