Lights, Camera, Interrogation! NYPD Rolls Cameras on Suspects
We don't know about that. Law & Order and Cops have been on TV for decades, and crime's been plummeting nationwide since they went on the air. Plus, the Internet already offers lots of tips 'n' tricks for willful evaders.
At present the police are not obliged to record interrogations of suspects even if they ask for it. So if the camera happens to suffer a malfunction mid-scene, it probably won't be a problem.