When Is It Legal to Shoot a Trespasser? In general, property owners in Arizona are not allowed by law to employ deadly force in protecting their properties from trespassers. They may, however, use their guns to shoot at intruders in self-defense. This may only be applicable if they fear for their lives or if they believe that the intruder is capable of inflicting serious bodily harm, and is about to do so. Simply put, shooting at a trespasser can be considered a legal gamble because you can still potentially be held civilly or criminally liable if you are proven to […]