The last place I would want to be while drunk is a meeting, Can't imagine how painfull it is to be drunk and knowing that I need to be in a meeting, however this has happened in my home groups.
Usually there is nothing said to the person, they are left unless they ask for help. Once a guy took a bottle into the meeting, he had been drinking it outside prior to the meeting, no one said anything but I thought a boundry had been crossed, be drunk if you have to be but taking a bottle to the meeting was a bit much!
Anyway, in my neighbourhood no-one is turned away. provided they don't cause trouble or start fights.
Rose