Article on muzzle discipline it's a long article so I just added a link.

The problem: muzzle discipline is often not practiced In training, in simulations and in real life, we consistently see muzzles pointed at people (or targets, in training) that we donít intend to shoot at the moment. Sometimes when we see that on the street, it results in someone we donít want to shoot or arenít justified in shooting getting shot or killed.

Muzzle Discipline