Are college professors or coaches "mandatory reporters"?

I know that if I, as a foster parent, don't report something (not just my kids but ANY kids) that I would facing time. Same goes for any public school teacher.
I also know that the janitor should have grabbed the biggest wrench/shovel/broomhandle at his disposal and planted in in the coach's head when he caught him in the act.
"All that is necessary for the triumph of evil is that good men do nothing." --Edmund Burke
"If you do nothing, are you still good?" --me