ShutterstockThe FBI calls it a “sensitive investigative technique” that it wants to keep secret. But newly released documents that shed light on the bureau’s use of a controversial cellphone tracking technology called the “Stingray” have prompted fresh questions over the legality of the spy tool.

Functioning as a so-called “cell-site simulator,” the Stingray is a sophisticated portable surveillance device. The equipment is designed to send out a powerful signal that covertly dupes phones within a specific area into hopping onto a fake network. The feds say they use them to target specific groups or individuals and help track the movements of suspects in real time, not to intercept communications. But by design Stingrays, sometimes called “IMSI catchers,” collaterally gather data from innocent bystanders’ phones and can interrupt phone users’ service — which critics say violates a federal communications law.

FBI Documents Shine Light on Clandestine Cellphone Tracking Tool | DFI News.

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