The US Supreme Court ruled that law enforcement officers must obtain a warrant before accessing mobile phone location data through geofence warrants, strengthening privacy protections under the Fourth Amendment.
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What happened
The US Supreme Court ruled on June 29, 2026, that police officers must have a valid warrant to access mobile phone location data collected via geofence warrants. These warrants compel technology companies like Google to provide location history data within a specific area and timeframe. The ruling came in the case of Chatrie vs. United States, involving law enforcement obtaining data within 150 meters of a credit union where a robbery had taken place.
This decision builds on the 2018 Carpenter ruling, which limited warrantless collection of cell-site location information. By affirming that location history data is subject to the Fourth Amendment, the court rejected the government’s claim that consent to share location data with Google negates privacy protections.
Why it matters
The ruling marks a significant victory for privacy advocates who have long argued that broad geofence warrants allow mass surveillance of innocent bystanders without probable cause. The decision confirms an individual's reasonable expectation of privacy in location data, regardless of supposed user consent to enable location features on devices.
This case highlights growing concerns around law enforcement's reliance on new technologies that collect sensitive personal data. While the court stopped short of banning geofence warrants outright, the ruling sets a precedent that can impact how courts evaluate such surveillance tools and may prompt legislative reforms.
What to watch next
The Supreme Court remanded the Chatrie case to a lower appeals court to review the validity of the disputed warrant under this ruling. Legal observers will be monitoring how courts continue to interpret the boundaries of digital privacy, particularly with evolving data practices from tech companies and continued use of data brokers.
Meanwhile, privacy groups like the EFF have indicated they will push further for the elimination of geofence warrants. Legislators in the US are also considering bills aimed at tightening regulations on government access to private data and addressing the broader 'data broker' loophole in surveillance laws.