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Of the wife leading up to it, and whether it should play a part. Watch. I have lived here my whole life. I have never had to go through anything like this. Dont none of all know me, but i dont e do nothing to nobody. Anybody say so theyre a liar. They a damn liar. Bull p [ bleep ]. [ bleep ]. That was somebodys son. That was somebodys child. Burn this bitch down. Burn this bitch down. So those are the words at issue and the context surrounding them. And so this is what was said to laura ing ram, and the rest of the rioters sghch er rioters. You hear that sound bite and what is your reaction . ...

Do you understand? >> yes. >> standby. >> hey sh, hey. back up, back up. back up! put your hands up. put your hands up. drop the knife right now. drop it. >> reporter: while the volunteers make split second decisions, brain waves and hard rates checked part of an ambitious research project at washington state university partly funded by the defense department with the goal of improving justice in america. professor brian viola is the man in charge. >> we don't know yet still 100 some years since teddy roosevelt had the first police firearms training in new york, we still don't know whether the...