I know that anyone can copy and paste anything but here's something that I believe could be useful:
Conditions of use
Each state differs with respect to the specific instances in which the Castle Doctrine can be invoked, and what amount of retreat or non-deadly resistance (if any) is required before deadly force can be used.

In general, one (sometimes more) of a variety of conditions must be met before a person can legally use the Castle Doctrine:

An intruder must be making an attempt to forcibly enter a premises uninvited
The intruder must be acting illegally -- i.e. the Castle Doctrine does not give the right to shoot officers of the law acting in the course of their legal duties
The occupant(s) of the home must reasonably believe that the intruder intends to inflict serious bodily harm, or death, upon an occupant of the home
The occupant(s) of the home must reasonably believe that the intruder intends to commit a felony
The occupant(s) of the home must reasonably believe that the intruder intends to commit arson
The occupant(s) of the home must reasonably believe that the intruder intends to commit burglary
The occupant(s) of the home must not have provoked or instigated an intrusion, or provoked or instigated an intruder to threaten or use deadly force