Members will need a lot more information about this situation. The question you have asked makes no sense.
We need to know what has happened, your role in this matter, the school's disciplinary policy for teachers, etc, etc.
You should first start by reading your school's policies on how teachers are to act and what the consequences are for not obeying those policies. The answer to your question should already be there. If there are no policies, then someone needs to write them quick smart.
Your second action would be to interview the teacher and ascertain what his/her problems are, and then work out what to do going forward.