 Well, you start at ground zero. That's the home. That's the family. They know his movements. They know who he associates with. They know his behavioral pattern and on and on and on. So you start with the family and then you extend out to friends, maybe work relationships, et cetera. But ground zero is critically important. Neighbors may have seen him acting differently. Where did he get the gun? All kinds of questions and dots need to be connected.