Often what happens, just like the Catholic church, is that the incident is covered up, the teacher is allowed to resign quietly, and is passed on to another private school.
http://www.theglobeandmail.com/news/national/retired-ucc-teacher-guilty-in-sex-case/article4111899/
Note that in the Clark Noble case, he also taught at private schools Shawnigan Lake School and Ridley College. He was passed around like a hot potato.
If it happens once, it’s time to go Biblical on their evil ways.