"When that happens, or when an officer in the course of an otherwise "justified" use of deadly force happens to shoot an innocent bystander, or has a mistake of fact shooting, the worst thing that usually happens is the officer gets fired. The department accepts all the liability and pays any settlements."

Not always. I have seen police officers hung out to dry if the powers to be didn't like the guy.

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John 3:16
WAR EAGLE!