Here's the newish Florida law:
The Florida measure says any person "has the right to stand his or her ground and meet force with force, including deadly force if he or she reasonably believes it is necessary to do so to prevent death or great bodily harm."
Florida law already lets residents defend themselves against attackers if they can prove they could not have escaped. The new law allows them to use deadly force even if they could have fled and says that prosecutors must automatically presume that would-be victims feared for their lives if attacked.
Q. When can I use my handgun to protect myself?
A. Florida law justifies use of deadly force when you are:
Trying to protect yourself or another person from death or serious bodily harm;
Trying to prevent a forcible felony, such as rape, robbery, burglary or kidnapping.
Q. What if someone is attacking me in my own home?
A. The courts have created an exception to the duty to retreat called the “castle doctrine.” Under the castle doctrine, you need not retreat from your own home to avoid using deadly force against an assailant. The castle doctrine applies if you are attacked in your own home by an intruder or an invited guest.
Q. What if I am in my place of business and someone comes in to rob me? Do I have to retreat before using deadly force?
A. The castle doctrine also applies when you are in your place of business. If you are in danger of death or great bodily harm or you are trying to prevent a forcible felony, you do not have to retreat before using deadly force in self-defense.
Q. What if I am in my vehicle?
A. A person has no duty to retreat in his lawfully occupied vehicle against a person who was in the process of unlawfully and forcefully entering or had unlawfully and forcefully entered an occupied vehicle or had unlawfully and forcefully removed or was attempting to remove another against that person's will from the occupied vehicle.