Started about a year ago. They are turned on when the shift starts and can't be turned off until the shift has ended.
Mounted on a hat above the right ear and they have sound.
Indiana, by the way.
This is absolutely needed. The powers that be forget far too often that they themselves are human and not only make mistakes but are corruptible as well. Kudos to your locals for doing this!
Of course this wouldn't stop a sudden application of silly putty on the lense and/or microphone. The mic would be the better choice there - "I'm sorry sir but we seemed to have had audio transmission issues during that incident."