I'm not sure whether they cover this on U.S. networks but it's interesting to listed to a report on Al Jazeera about the 'Sting Ray' surveillance system originally designed for use against terrorists but not in increasingly wide day-to-day use by forces across the country. The system consists of radio towers that emulate cell phone towers an trick mobile devices into sending access information, data and other information. The judicial logic allowing use is that it is not actually surveillance. "The government did not install the tracking device — and the cell user chose to carry the phone that permitted transmission of its information to a carrier," Gorenstein held in that opinion. "Therefore no warrant is needed." The ACLU lists police departments using the system. Here's an EFF report from a couple weeks ago.
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