In 2014, Baltimore Police obtained a warrant for the arrest of Kerron Andrews for attempted murder. To find him, law enforcement requested a pen register to record his location data and all outgoing phone calls. The request, however, didn’t ask about using a Hailstorm (a type of Stingray — a bulk collection device meant to intercept data meant for cell towers) to collect this data. The police used it anyway. Warrantless bulk collection by use of a Stingray isn’t anything new. The secrecy is often due to an NDA (like this one) between law enforcement and the FBI itself. After learning about…

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