The case involved “geofence” searches, which allow law enforcement to find suspects and witnesses by sweeping up location data from cellphones near crime scenes.
The case involved “geofence” searches, which allow law enforcement to find suspects and witnesses by sweeping up location data from cellphones near crime scenes.
So-called geofence searches have become a popular tool for law enforcement, but critics say they put at risk the personal data of everyday Americans and violate the Constitution.