Exemption from any deeds committed following an alcohol blood content of .2% or higher. As blood alcohol content reaches a level that reduces the individual dramatically, they have a sort of 'diplomatic immunity', you know, cause they have no fucking clue where they are.
Person 1: Okay, why were naked in the bathtub, who was that whale, and you better put that porch swing back wherever you found it.
Person 2: Dude, you saw how much he drank last night. I call Drunken Immunity.
Drunk Guy: Case dismissed! The swing stays!