Alabama has the "stand your ground" law, but, like most states, no one knows exactly what it means yet. Cases like the one in FL haven't helped. There has always been a saying in the law that "hard cases make bad law." Without getting too technical, at common law, one was always required to retreat as far as possible before using deadly force. If you're in your home, you were considered to have already retreated as far as possible. Some states broadened it to the "close," the territory immediately surrounding the home. In public, you were on your own to prove the retreat. I think the fear a lot of prosecutors have had is the temptation towards vigilantism...