Before Using StingRays, Police Must Sign NDA With FBI

v3rgEz writes Advanced cell phone tracking devices known as StingRays allow police nationwide to home in on suspects and to log individuals present at a given location. But before acquiring a StingRay, state and local police must sign a nondisclosure agreement with the FBI, according to documents released via a MuckRock FOIA request. As Shawn Musgrave reports, it's an unusual setup arrangement for two public agencies to swear each other to secrecy, but such maneuvers are becoming more common.