I required he pass a breathalyzer (before and after) and it started out with just afternoon visits. Then it went to one overnight...the long and short is he failed and now I have full custody as he wasn't willing to go into treatment. My final divorce date is this May. I was concerned my giving the breathalyzer would
backfire but it worked out. We had a mediator and set up the arrangement via the mediator and that became a court document.
Best wishes.