It's retrieving information that maybe hidden on a phone or a computer that's been deleted. the forensic ability can help this. so combining both kind of forensic analysis as well as behavioral analysis aspect of this, it can help put more in perspective, bring this person into focus, what led them to that. was there any trail, any leakage beforehand that may be indicative that this person was going to trike out. >> sandra: bill, there will of course be many days of reviewing what exactly happened, how it happened and how this person was able to breach the side door of that school. two big thi...