invaluable source of information to prevent this kind of thing in the future. they came away with a lot of material to pass on to schools administrators. it is a valuable study. >> tucker: what was the profile to the extent that there is one. each case is unique, but is there a thread that ties them together. >> one of the interesting threads and pieces of information that they came away with was the preattack notifier and behavioral pattern was very similar, tucker. a large majority of these school shooters had told someone about the plan in some form of advance. i get it, if you see something, say something a thousand truck was. it has almost become that people yapped it off, but you think somebody may be depressed. listen, we may have a problem here. it does not mean that that