I have two experiences in elementary school that I feel should be put on here. Along with some lessons from both of them.
Something to take from this is to tell your children that they can talk about mistakes they made at school and how the teacher reacted so that this kind of stuff can be caught. Encouraging your child to have open communication with you is extremely important anyways. It helps you to build a trusting parent child relationship.
Something to take from this is that there should be more communication between staff at schools. If you are a teacher or becoming a teacher and a student is suddenly missing after a recess, please call the office and ask if they were checked out. That is what the check out system is for.
Not anything a teacher did but I am also angry that there were registered sex offenders near local schools of mine.