Since each group of AA is atonomous, there will be different ways of handling this situation. How it has been treated in my area is this - if someone shows up to a meeting intoxicated, a couple of same-sex members with good quality and quantity sobriety take the person outside the meeting and councel them. Thus the meeting is not disrupted and the intoxicated person gets a "12 step call," which offers them a solution such as detox, rehab, or help sobering up and getting to more meetings.