WILL CAIN (FOX HOST): Tucker, I've been listening to you tonight, and you’ve been asking some important questions. For example, I heard you ask Judge Pirro earlier in the show, do we study these things? Do we study these shooters? How can we stop them in the future? You know, in the ‘80s, we put together a behavioral science unit at the FBI to stop serial killers. Now, these guys in these situations often kill themselves. We can see what makes them tick. We can do more.