I think the biggest factor here is not what the police will think, but what will the jurors think about you drinking and then defending yourself?
You may feel 1 or 2 drinks is fine for you to function normally and drive just fine, but what if the jurors feel you are guilty of murder because your judgement was impaired?
Just my thoughts on the issue. I don't drink, so I don't need to worry about this.
A couple weekends ago I was in Minneapolis and I got to carry in a bar for the first time (I live in WI...WI sucks. Can't even carry in a restaurant if they serve alcohol.). Especially since the bar was in a sketchy neighborhood, I was glad I was able to carry. I am moving to Colorado soon, so I am very happy with CO laws that I can carry in restaurants that serve and bars. Should my fiancé want to go out, I can go out with her and protect us, and not have to leave the gun(s) at home.