U.S. Supreme Court Rules Geofence Warrants Are Fourth Amendment Searches
The justices ruled that obtaining cellphone location data through a geofence warrant constitutes a Fourth Amendment search, sending the case back to a lower court for further review.
WASHINGTON — The U.S. Supreme Court ruled Monday that law enforcement’s use of a geofence warrant to obtain cellphone location data is a search under the Fourth Amendment, marking a major decision on digital privacy in the modern era.
In a 6-3 ruling in Chatrie v. United States, the court held that obtaining location history from a geofence warrant implicates constitutional protections against unreasonable searches and seizures. However, the justices stopped short of deciding whether the specific warrant used in the case was constitutional, instead sending the case back to a lower court for further review.
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The case involved Okello Chatrie, who was identified as a suspect in a 2019 Virginia credit union robbery after investigators obtained a geofence warrant directing Google to provide location data for devices near the crime scene during a specific period. That search initially identified multiple devices before investigators narrowed the list to Chatrie.
Writing for the majority, Justice Elena Kagan concluded that individuals maintain a reasonable expectation of privacy in their cellphone location history, even when the information is stored by a technology company. The ruling rejects the argument that users automatically surrender constitutional privacy protections simply by enabling location history services.
Geofence warrants differ from traditional search warrants because they do not initially target a known suspect. Instead, investigators seek information on every device located within a defined geographic area during a specified time frame, then work backward to identify potential suspects.
The decision builds on the Supreme Court’s 2018 ruling in Carpenter v. United States, which held that police generally must obtain a warrant before acquiring historical cellphone location records from wireless carriers. Monday’s decision extends Fourth Amendment analysis to geofence warrants, recognizing that government acquisition of detailed location history constitutes a search subject to constitutional scrutiny.
The Supreme Court did not determine whether the warrant used against Chatrie ultimately satisfied the Fourth Amendment’s requirements, including probable cause and particularity. Instead, it instructed the lower court to reconsider the case using the legal framework established by Monday’s opinion.
Privacy advocates have argued that geofence warrants function as digital dragnets because they can collect information about numerous people who are not suspected of any crime. Law enforcement agencies, meanwhile, have maintained that the technology can be an important investigative tool in cases where no suspect has been identified.
The ruling is expected to influence how courts evaluate digital surveillance techniques and how investigators seek electronic location data in future criminal investigations.