Clerlic

I guess I don't have enough information, thank you for the answer.

I'd like to hear an opinion of someone who's pro at psychiatry about this crazy dude that hangs out at our university. He's about 50 years old who goes to random lectures and constantly mumbles stuff that doesn't make sense. Sometimes he asks random people questions about homework or touches people's backs or shoulders. He also handles other people's belongings when they're not around, although I don't know if he steals anything. So yeah, I'm wondering what kind of mental disorder causes this, apparently he's not dangerous because he's not locked up, thanks!