more chicago police officers are shot and killed raising the total to six. it's a record high for any year in more than two decades. >> secured. pursuing custody. >> the question that's on every cop's mind, when do we reach the breaking point? >> whose gun is that? >> i don't know. i keep telling you i don't know. >> bottom line, tonight the story don't stick up. you understand what i'm saying? i just found the gun a foot and a half from your hand. after you ducked back in the car after we pulled up. >> every day is different. you talk about stress and adrenaline, you have to be able to immediately ramp it up to address a level of violence that may result in death. everybody has their own way to try and deal with it. and they have to have their own way. you can't keep that bottled up