Interesting area of discussion. I am in Washington State. My birthday is tomorrow, so I guess I've been carrying concealed just about 36 years. We occasionally go out to dinner. She may have a glass of wine. I may have a beer with my steak. I carry a 1911, she carries a revolver. More often than not, she drives (mostly because we read to each other on the road, and she likes me to read). The smallest one of us is 220 lbs. so I never really give much thought to intoxication. But if there was some sort of self-defense "event," I'm sure any alcohol at all would be become an issue.
I guess this is one more thing to worry about. Neither of us is likely to become intoxicated. I'm a former EMT, and she's an ex-cop, so we both strongly frown on intoxication or even loss of situational awareness. I'm not about to become a teetotaller just because of fear something might happen. But we'll do our best to remain "aware."
“The police of a State should never be stronger or better armed than the citizenry. An armed citizenry, willing to fight is the foundation of civil freedom.” Heinlein