Good Luck My Friend...
...you likely know I've been down this road, and it's a rough road. In retrospect, it was the right road for me to take.
I don't know about where you live, but I have a buddy who is an alcoholic drug addict. When he divorced his record was squeaky clean, but his wife claimed without proof he was exactly what he is and the court ordered random UIs (he was eventually busted and she got sole-custody). Maybe you'll have the same luck as she did.
I wish you the best in this,
Cyranoak
P.s. He did, eventually, find recovery. It took a lot of failed drug tests and his beautiful baby girl to get him there, but there he is. At least for now.