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mrbluze writes:

"Columbia Tribune / AP reports of Police agencies' reluctance to divulge details about the Stingray cell-phone interception device, whose use has increased since a Supreme Court decision to prevent the use of GPS tracking devices without a warrant. The Stingray is reported to be a suitcase-sized device that pretends to be a mobile phone tower, tricking a cell phone to connect to it instead of the cellphone company's tower, but details on how this works are not revealed.

In one of the rare court cases involving the device, the FBI acknowledged in 2011 that so-called cell site simulator technology affects innocent users in the area where it's operated, not just a suspect police are seeking.

A December 2013 investigation by USA Today found roughly 1 in 4 law enforcement agencies it surveyed had performed tower dumps, and slightly fewer owned a Stingray.

However, a report by GlobalResearch.ca gives much greater detail, including photographs of the device:

When a suspect makes a phone call, the StingRay tricks the cell into sending its signal back to the police, thus preventing the signal from traveling back to the suspect's wireless carrier. But not only does StingRay track the targeted cell phone, it also extracts data off potentially thousands of other cell phone users in the area.

Although manufactured by a Germany and Britain-based firm, the StingRay devices are sold in the US by the Harris Corporation, an international telecommunications equipment company. It gets between $60,000 and $175,000 for each Stingray it sells to US law enforcement agencies."