When I mentioned that my husband is a alcoholic to one lawyer she suggested a app called soberlink (I think?). It’s used in custody cases. It uses facial recognition and works like a breathalyzer. So potentially I could have it in the custody agreement that he blows into it before, during and after visitation.
I would be mindful of taking pictures/videos too. I think it’s a good idea but my ah saw pictures I took of the downstairs fridge with 10-20 massive size Windsor bottles. The pictures went to our combined photo sharing app. He flipped after seeing the pictures. So just make sure he doesn’t see or have access to the video(s).
Honestly your best bet it to go to a lawyer. One that has history dealing with a alcoholic ex would be best obviously!