From my own experience, ours didn't act out of school, not to the teachers. But he did sexually abuse at least one disabled young man in the special education class. He pretended to befriend this kid.
kids like this are a danger to society and are very sneaky about it. He has made you think he's safe except at home. That is most likelu untrue. He may not act outat school, but that doesn't mean he isnt being dangerous.