Advertisements While I thought the signal jammer device seemed plausible for disabling wireless cameras, I don't understand why Natalia's hearing aid would be affected. Can hearing aids get interference from EM devices? And why would she get interference from the microphone that Eric was wearing? I thought his microphone was saving to tape, not being transmitted via a signal (after all, he did promise to "edit out" various things). On a related note, I can believe that the jewelry store would have wireless cameras, but the lab? I would expect the cameras in the evidence room to be hard-wired. And another thing: I don't understand the idea of using the jammer to cover up the evidence room robbery of the diamonds. Don't those cameras get saved to tape/disc/whatever? Why can't they just look back to when the interference started and see who turned on the jammer?