Once again that rookie cop who has killed twice finds himself in hot water with his partner. They tuned a guy up in an alley and the guy died. They made up a cock and bull story to avoid punishment. The blue line comes into play when Danny and Andy investigate and realize they are lying and are murderers. I guess this code of silence really does exist, based on the day to day danger these guys face. So you should be able to do anything you want as long as there are no witnesses. This episode shows how hard this is.
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