"public intoxication" is not hard to be convicted of - does not even require BAC - not sure why there is any question that J1 is a potential problem for anyone who drinks any alcohol - remember the Fairfax restaurant raids in Christmas of 2002?
All that is required for a DIP is the officer's perception, based on his training and experience, that you have been drinking. The odor of an alcoholic beverage on your breath, slurred speach, glassy eyes/appearance, unsteady gait, etc.
Any amount of alcohol you ingest has some
degree of impairment attached to it, thus placing you under its influence. If you need to drink, leave the gun home.
You can also take allergy medicine and be intoxicated, or use spray paint in your garage and become intoxicated, hell I remember this one chic I dated in highschool, f*cking knock out gorgeous, I became all goofy and "intoxicated" every timeI was around her.
Being under the influence does not automatically make someone more or less responsible, it comes down to each and every individual. You know personal reponsibility.
A while back some friends of mine had come over to shoot on my range. One of my friends had drank a few beers, maybe 3 or 4, my other friend was waiting until after they shot to drink a few.
When my drinking friend was questioned about his drinking and then wanting to shoot his pistol, he said something that made perfect sense... he said "If I'm at home, and somebody breaks in, there is a good chance, I will have already drank a few beers, shouldn't I practice shooting after I had been drinking, since there is a good chance I will have been, if somebody kicks in my door"? Made sense to me then and it still does.