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A Police Gadget Tracks Phones? Shhh! It's Secret

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Joe Simitian, Santa Clara County, Calif.

Joe Simitian, a Santa Clara County, Calif., supervisor, pressed for more information about the StingRay surveillance device.

Credit: Jim Wilson/The New York Times

A powerful new surveillance tool being adopted by police departments across the country comes with an unusual requirement: To buy it, law enforcement officials must sign a nondisclosure agreement preventing them from saying almost anything about the technology.

From The New York Times
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