They should have to request it over the radio and the camera should be remotely disabled. This would mean they couldn't turn it off in mere seconds in the heat

They should have to request it over the radio and the camera should be remotely disabled. This would mean they couldn't turn it off in mere seconds in the heat of the moment or right after taking a call before it was resolved. It's not a perfect solution but it's pretty good. Another option would be for the "off" button to mark that section of the tape as "off duty" and store it in a special archive that required a court order to access. That way the only time we would need to look is if there was some issue where there was an empty spot in the recording during an event where they were clearly not "off duty". I think it's worth pointing out that while using the bathroom I don't think a chest/shoulder mounted body cam would see much, if anything, inappropriate. It's not attached to their head looking where they look.