I think it more of a training issue with the teacher than the school endorses this type of discipline. The school fired the teacher so obviously the school doesn't allow taping kids mouths shut.
I agree...it was the teacher's decision to use that method...I agree with the schools decision to not use her as a substitute anymore, though it could have been just as appropriate to reprimand her so she understood that was not allowed and give her another chance. If she messed up again, press charges!