He would have been investigated and warned only. Back then, teachers were getting away with ‘murder’. They had to be complete morons to end up in court.
Male teachers were free to break all the rules of their local education department regarding CP. How did this work? Well, say the teacher slippers a girl against local rules, and the parents complain. The education district, at best, would promise to remind the teacher of the rules. Under this circumstance, the teacher would wait a while, then start doing it to other girls. On the other hand, the parents could go to the police. The police, checking the law of the land, would say (correctly) that no law had been broken.