The tactic largely depends on if you want to stay in the Borg.....I'm assuming that is the case.
Blood Alcohol content is not necessarily considered relevant. The definition of drunkeness is a matter of BEHAVIOR. (Behaving in a drunken manner) Medication could be a factor.
This heavily relies on witnesses, or maybe a DUI, maybe even published in the paper. Several family members saying they repeatedly saw a person drunk is quite different from one person saying that someone was drunk. Absolutely he can face his accusers.
In the end, be cooperative but shocked that anyone would say such a thing and that you will be happy to settle the matter with the offended person. You would never want to give Jehovah a bad name ....blah, blah, blah