Unless they did extensive testing and psychological profiling they will not know the extent of the risk. This guy we have dealt with is a total risk and he is in the school and rode the school bus with young kids. He had a "shadow" who was hired to keep track of him on school grounds but that...
I had the same situation at my daughters high school, turns out his charge was rape of a 5 year old child. So yes they can be a threat and it isn't necessarily a "misunderstanding" between another very close in age teen. I don't care if they are a juvenile and are protected, if they choose to...