[BenLurkin]

Here is California Penal Code section 198.5. Judges haven't had an trouble interpreting it.

"Any person using force intended or likely to cause death or great bodily injury within his or her residence shall be presumed to have held a reasonable fear of imminent peril of death or great bodily injury to self, family, or a member of the household when that force is used against another person, not a member of the family or household, who unlawfully and forcibly enters or has unlawfully and forcibly entered the residence and the person using the force knew or had reason to believe that an unlawful and forcible entry occurred."

[Still Thinking]

So self defense is an affirmative defense where the burden of proof still falls to the state. Is that about it?