The New York PD dropped their "Stakeout Squad" Program, not b/c it didn't work, but b/c they were losing too many good cops, after they killed people. Killing affects you, even when the people you kill are human filth...
A big city cop -- down South -- told me he was pursuing an informant that ran, and he was very mad.
If he opened up on an unarmed man, that would have been his career.
Also, by my beliefs, the informant might have gone to hell [which I consider to be such a terrible place, I do not want people to go to].
He emptied his gun at the guy in front of a store with a huge glass window. There was no way he could have missed with all the bullets the guy.
Not only did he miss the guy, they could not find a single bullet he fired.
I think the result was that he was not disciplined because they could not prove he fired his gun -- even though he told them that he did.