even his math teacher says that he felt threatened by his behavior in class. he was a threat. he actually wrote something on the quiz that said mayhem best and wrote that in big, bold capital letters. >> yep. it appears all the warning signs were there, but no one did anything about it. drew griffin is investigating loughner's background from arizona. drew, let's start with you. what else have you been able to find out about loughner? >> well, we talked about that math class. that math class was an elementary algebra class. from day one, the math instructor told me that loughner was making random incoherent outbursts. he was challenging the authority of the teacher. and then he would kind of cocoon himself with ipods and not