I can totally see them doing it. It would be the same as the GP described. It wouldn't be compulsory but those that don't agree get their good time reduced, get

I can totally see them doing it. It would be the same as the GP described. It wouldn't be compulsory but those that don't agree get their good time reduced, get written up, marked for non-cooperation and so on. In other words there enough mechanisms for this to happen.