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Drop it. drop it. at one point he drops it, puts it away. he holstered his arms -- his firearm. and then he went back at it and then he had to take him down. such a hard job being a police officer. watch this. >> drop the [ bleep ] knife. drop the knife. drop the knife. >> i will drop the knife. >> drop it! >> hey! hey! hey! >> whoa! whoa! whoa! [ bleep ] [ bleep ] [ bleep ]. >> they fired one shot -- >> well, because of the criticism that the cops have been receiving over the last couple of months, they could have shown more restraint and maybe gotten hurt because of it. they could have shot ...

He had just assaulted his ex-girlfriend and hit his own child, whom she was carrying in her arms. at 33 years old, he was already a career criminal, nearly 30 previous arrests. many felony convictions. and the two perry policemen were about to find out just how dangerous he could be. >> you terrorized an entire community. >> he's a traditional domestic abuser, a control freak. >> i'm surprised you're here today because of what went on that day. >> reporter: mccarty was in the home, holding a knife and threatening to police. >> drop it. taser, taser. >> reporter: the taser couldn't penetrate hi...

Spend your investigative time on? it's so tone deaf and i think prosecutors are looking at what will and not be tolerated but this is not the time for this. >> i want to continue this on twitter. tweet me what you think. thank you so much. set your dvr, watch 360 whenever you'd like. learn what went on with a police officer at moments like this. >> hey, back up. back up. put your hands up. put your hands up. drop the knife, right now. drop it. >> when police officers make the decision to shoot or not to shoot and how they learn when to make that decision. he's one of the most most wanted kille...

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...

Put your hands up. drop the knife. 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. >> 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 there's a connection between the training we give police officers and their performance in a combat situation. >> your proof of insurance and registration. >>...