Need some assistance

I got a friend in security that's trying to find some info (articles/books/presentations/etc) for an upcoming course. Here's the info he sent me:

"I'm interested in sociopathic and other aberrant behaviors in the workplace, either by employees or visitors, especially early behavioral signals or warnings of impending criminal or terrorist behavior. The audience is security personnel and department managers, and it's an "awareness" level 4-hour training course. We're not trying to develop profiling experts.

The specific driver for the course request from this client is that analysis of a workplace incident has shown that in retrospect there were clues, going back from when the employee was hired and even before that, that were not picked up. You could say that this is one of those "due diligence/due care" training classes."

Any help in finding information regarding this would be much appreciated.