A detailed look at how police forces use "geofence" warrants and Google's Sensorvault location history database to find witnesses and suspects near crime scenes (Jennifer Valentino-DeVries/New York Times)

Jennifer Valentino-DeVries / New York Times:
A detailed look at how police forces use “geofence” warrants and Google's Sensorvault location history database to find witnesses and suspects near crime scenes  —  The tech giant records people's locations worldwide.  Now, investigators are using it to find suspects and witnesses near crimes …