If you've ever watched 'The Real CSI', not the American tv series though it does mirror true life very closely, you would realise that 1 little scrap of evidence, 1 snippet of a remark can through a whole new light on an investigation.
It won't bring anyone back but could help them to identify why it happened and signs to lok ot for in the future
I can't imagine what. The guy owned fire arms legally. He flipped and shot a load of people. I still don't see what can be found.
It happened cos he went nuts and had a gun.
What might they find out? example?