In the CSI Miami Season 4 opener, Horatio has to kill a bad guy who is trying to strangle a woman in the hospital. He takes out "Diablo" with one shot.

Pretty impressive, but there's a problem. When police officers shoot, according to CSI Vegas, they don't just fire off one round. Nick and Warrick even said it once (in the epi where Captain Brass was a supsect in the murder of a drug dealer and they were using the shooter's technique to help prove it wasn't an experienced cop).

Nick: What kind of cop doesn't empty the barrell?

Warrick: Right, they shoot to kill.