“The suitcase-size tracking systems, which can cost as much as $400,000, allow the police to pinpoint a phone’s location within a few yards by posing as a cell tower. In the process, they can intercept information from the phones of nearly everyone else who happens to be nearby, including innocent bystanders. Dozens of police departments from Miami to Los Angeles own similar devices. A USA TODAY Media Network investigation identified more than 35 of them in 2013 and 2014, and the American Civil Liberties Union has found 18 more. When and how the police have used those devices is mostly a mystery, in part because the FBI swore them to secrecy.”
http://www.usatoday.com/story/news/2015/08/23/baltimore-police-stingray-cell-surveillance/31994181/
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