A couple of things jumped out of the text in your post:
Your user name is wifeofadrinker but you don't know if your husband is an alcoholic. The drinking you described over the recent weekend did not sound like heavy drinker, a problem drinker, or an alcoholic to me. It sounded like normal, responsible drinking to me.
When has driving stopped an alcoholic from drinking?
I would have to echo the comments of others here that you need to make an assessment of that. As long as you aren't sure, or as long as you have incorrectly labelled him an alcoholic when he may not be one, you will waste a lot of time and grief not being able to get to the bottom of what your problem actually is.
What kind of behavior made you think your husband is an alcoholic?