Bung: Unless you're overfilling large wine glasses it's rarely a glass or 2 that ends in tears if everyone is honest.
AFAIK the problem is the drivers well over the limit. Driving with zero alcohol is a good idea because you never know when you will encounter one of these idiots.
was thinking about 40-50kg girls which is quite common for some ethnicities and maybe those even taller but they may not be used to alcohol like a special event drinker so even if the reading is low it can have an effect on their driving too ...