I believe I read that it had long been rumored among the students, but the faculty never believed it. I think they might have tried to confirm it, but the school's filters blocked them. I know she was finally busted when some of her coworkers produced videos for the school board.
Sadly, we live in a society where you can fire a former porno chick for moral turpitude, but snitches are hands off. Setting a poor example, IMO.