EFF Tells Minnesota Supreme Court to Strike Down Geofence Warrant As Fourth Circuit Court of Appeals Takes the Wrong Turn
Briefly

Geofence warrants raise Fourth Amendment concerns by requiring providers like Google to search all user location data in a geographic area, risking innocent people's suspicion and exposing private information.
Court cases like State v. Contreras-Sanchez set crucial Fourth Amendment precedents for geofence warrants and similar 'reverse warrants' like keyword searches on search engines.
Read at Electronic Frontier Foundation
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