It hasn't worked for my AW. Last time we had a confrontation about it, our daughter started bargaining with her. I knew that was a waste of time (AW was still tipsy at the time), but I stayed out of it. AW promised to only drink when one of us was there with her, and only one drink.
The next morning, she was sober but all defensive. She said that if we were going to be "that way" about it, she'd just quit.
Well, that lasted about a week. Every time we confront her about her drinking, she denies that it's a problem and swears that she can control it. She seems able to abstain for periods of time... a few days, a couple of weeks... but she always winds up comatose drunk again.