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Link: https://www.rt.com/usa/411007-police-spying-imsi-stingray/
Dozens of police departments across the US are using special devices to track suspects without warrants. However, the International Mobile Subscriber Identity (IMSI) catchers also capture data from regular people on the street.
The technology, which was developed for the military, mimics cell phone towers and tricks phones into routing signals through them. This allows police to a track suspect's location. The machines even allow police to get the location of a phone without the user making a call or sending a text.