Stingray is a suitcase-sized device that masquerades as a cell tower to deceive cellphones into connecting to it.
It can show police phones within a mile or more and records meta data.
Cell phones are constantly searching out towers in search of the strongest signal, and phones mistake the Stingray for a tower allowing police easy access to your location.
It is not certain whether Stingray has the ability to intercept the content of calls or text messages.
Invoices for upgrades purchased by Milwaukee police and the DOJ in the last year bar disclosure without giving Harris “timely notice and the opportunity to challenge such disclosure under applicable laws.”
State Sen. Glenn Grothman, the senate’s lead sponsor of the cellphone tracking bill, said he is disturbed by the capabilities of the Stingray.
“We’re headed to the point where the government knows where you are at any time of the day or night, and we don’t want to be there,” said Grothman, R-West Bend. “The people who push these devices of course will always say that you can trust the government — they will never abuse their power. But a lot of our Constitution is based on the idea that you can’t trust the government with unlimited power.”’