I got permission from a professor to submit an essay to him that I wrote for one of his previous classes. It is academic misconduct to do this unless you receive permission from the professor.
Say the professor changes his mind for whatever reason and I have his permission in writing, what is to stop him from going back on his word during or after the class? I understand the Dean and Department Chair would also be involved. If I prove that I had permission, what can stop the university from failing me on the class or assignment and/or doing whatever they want essentially since it's basically a private business/entity? Would I need to sue the school?