You are still simply going with one glass of wine will affect everyone equally, and that is proven to be untrue. (Or stress, for that matter) While your friend

You are still simply going with one glass of wine will affect everyone equally, and that is proven to be untrue. (Or stress, for that matter) While your friend made a call judging their own abilities and the level of emergency, that's exactly how it should be: cars should not stop us humans for making that decision. (Fwiw, if you were just having an alcoholic drink, a breathalizer would show a much higher concentration even though alcohol might not have even kicked in or there wasn't enough for it to kivk in at all)