What's the security reason they need this? How many times has a security camera failed to do its job because it didn't have audio? What crimes do they thing they are going to solve? Are people breaking into the courthouse wearing masks but screaming their own names?
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I think one problem is, almost all security cameras are sold with audio these days. If the cameras have a mic, telling people "Oh, we turned the mic off in each camera" or "We don't record the audio" isn't very helpful.