SHEBOYGAN, Wis. (AP) -- A published report says police in Wisconsin have at least two devices that secretly track cellphone locations in real time to target suspects or missing persons.
The technology mines data from hundreds or thousands of unsuspecting people.
The devices are known by the trade name Stingray. The report says they raise concerns for privacy advocates because law enforcement officials won't say how often they use them, how the data is used, or whether they get a warrant before using it.
Law enforcement officials declined interview requests and redacted references to the Stingray in public records requested, but documents show the devices have been used for years by both the Wisconsin Department of Justice and the Milwaukee Police Department
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