Police secretly track cellphones to solve routine crimes

The crime itself was ordinary: Someone smashed the back window of a parked car one evening and ran off with a cellphone. What was unusual was how the police hunted the thief. Detectives did it by secretly using one of the government’s most powerful phone surveillance tools — capable of intercepting data from hundreds of people’s cellphones at a time — to track the phone, and with it their suspect, to the doorway of a public housing complex.
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