This is probably more common than we'd like to think.
Yes it is, before we had the Internet and instant access to all this stuff most schools would call everyone in and leave it up to the kids parents if they wanted to prosecute or not.
Most parents and the kids didn't want it to go public so the teacher would agree to quit and walk away and everything was kept hush hush. Now since no one is allowed to make decisions anymore and there is zero tolerance rules in place most schools administrators just turn it over to the D.A. regardless of what the parents and student feel.
My mom worked for the school system for many years, several teachers were let go because they just couldn't be trusted around the young girls, word gets around the school about them and the teachers listened, they knew who was shopping and who was not.