Along with joe d comments, you better have each incident well documented.In my dealings unions and the prison system, when I fire, free staff or inmate, It's hard for the union or the state to refute accurate documention.I have a safety violation form that all the supervisors fillout in each prison for unsafe act's, it is signed by the violator after couseling of the violation and filed. Three violations thier gone, and I have the signed violations to prove to the union and the prison.Belive it or not I have never had to hire any of them back.