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lookout for him. what goes through your mind when you hear something like that? >> well, i'm wondering how much of this behavior, what we call leakage, the inability to hide some type of damaging personality trait, this leakage was obvious to people and so you wonder two things, how was it not seen by the store and how is this guy allowed to get weapons? >> when you say leakage what does that look like because i think we've all been around oddballs before, right, but how do we know the difference between someone who is a little strange and someone who might actually be a threat? >> well, that's the big question, but there are -- i mean, an entire profession is growing up on threat assessment right now, and threat assessment takes all those behaviors and puts them into a matrix and comes up with a rating system. but two of the things that