Provide what source? Well from what I seen and what other's in the locker room seen is that he has a staring problem. There is a strange thing he does too is he puts his hand over his penis when he is talking to someone. Most people are uncomfortable with him in there.
They should be banned. I'm sitting in class and I see a classmate looking up answers on his phone and sometimes I see people playing games. I hate when I have to sit next to someone that has there music up and when the teacher tells them to turn it down, they do but than they turn it back up the next second.