Kentucky. Another funny thing in the wording... It's fine to shoot someone that is "denying use of your dwelling". This can be someone setting fire to it, tearing the side off with heavy equipment, illegally taking possession by force (no. eviction, foreclosure or any other legal means doesn't count), anything that would "deny use". But you can only use deadly force to protect outbuildings if they are attempting to set fire to it. If they're yanking the supports out of your barn with a chain and pickup or chainsawing the door off to get to what's inside, no dice. You can hold them for the police, but shoot them and you go to jail.
If you are protecting your own life, you are allowed a bad judgment call. You are allowed to use deadly force if the facts as you believe them to be would warrant the use of deadly force. If you think someone is about to kill you and you shoot them, but afterward it turns out to be just an April fool's joke, you will most likely get a pass, at least from criminal prosecution.
However, if you are protecting someone else's life, You are only allowed to use deadly force if the facts as they actually are warrant the use of deadly force. If you see a man and woman in the park doing the horizontal mamba and you shoot the man assuming she is being raped and it turns out not to be the case, you go to jail for negligent homicide.
If you are assaulted in an alley by an armed thug and shoot twice, one bullet striking the thug and the other going wide, only to find an innocent bystander at the other end of the alley, you go to jail for negligent homicide even though you were within your rights in shooting the thug.
just some interesting details I got from the class,
Ian