An anonymous reader writes "In 2008, the Seattle Police illegally arrested security consultant Eric Rachner for refusing to show ID. After Rachner filed a formal complaint, he was prosecuted for obstructing, and the police claimed that videos of the arrest were unavailable — until Rachner's research uncovered proof that the police had the videos all along." It's an interesting story of how he figured out how the system in use by Seattle police automatically tracks deletion, copying, or other uses of the recorded stream.
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