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The federal government’s recent disclosure in Maryland that a stingray cellphone-tracking device was used in a criminal case was rare, as the government and local law enforcement have mostly kept information about the device secret.

Related: FBI required Baltimore Police to ignore court orders on cell phone surveillance

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Stingray

Graphic by Emma Patti Harris.

This graphic originally ran November 21, 2014 and was updated April 9, 2015

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