The police records for his previous insanity:
http://www.dailynews.com/breakingnews/ci_17079366
We had a guy in E&M who was totally nuts. I looked at his notes a few times, and while derivations of Maxwell's Equations can look pretty, erm, greek, his notes were clearly unrelated to the class and "crazy" just from a glance (some stuff looked more like runes or hieroglyphs). He asked non-sequiter questions, etc. One day he missed class, and the prof told all of us to watch him, and be prepared to tackle him if he came with a gun or something. We all watched him very carefully. Scary to see those reports and how similar they are to my experience with a nut in class.