In the fifth interim release of documents in EPIC v. FBI, a Freedom of Information Act lawsuit, the agency has turned over nearly 300 pages about the surveillance technique directed toward users of mobile phones. The documents obtained by EPIC reveal that agents have been using "cell site simulator" technologies, also known as "StingRay," "Triggerfish," or "Digital Analyzers" to monitor cell phones since 1995. Internal FBI e-mails, also obtained by EPIC, reveal that agents went through extensive training on these devices in 2007. In addition, a presentation from the agency's Wireless Intercept and Tracking Team argues that cell site simulators qualify for a low legal standard as a "pen register device," an interpretation that was recently rejected by a federal court in Texas. For more information, see EPIC v. FBI (StingRay).
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by Ryan Calo, A. Michael Froomkin,