Teachers are supposed to be role models for their students...supposed to. In these cases, bad teachers were exposed and fired for things that really shouldn't happen in schools. And sometimes, good teachers were framed for horrible things.
"Our English Teacher turned up still drunk from the night before. Fortunately she had us 6th Years (17-18 year olds) for a double period first thing. We told her to go sleep it off and she did. We woke her up 2 hours later when the class finished. We had your back Mrs. Cairney!" Source