Michael from Muckrock sez, "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, documents released via a MuckRock FOIA request indicate. 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.
Cell site simulator acquisition and use (Tacoma Police Department)
(Image: Artiste se bâillonnant lors d'une opération symbolique à la manifestation NoCulture, Picture by M0tty, CC-BY-SA)