Hi Carrie
It will be what it will be, worrying about it won't change anything.
He needs to decide if drinking/drugging is interfering with life and putting him and anyone with him in a dangerous position...and DUI would do that, I would think.
If he's troubled by his drinking he should stop.
If you're troubled by his drinking, you need to take pause and decide what you will or will not allow in your life.
If neither of you are troubled, and he is court ordered to rehab or AA meetings....he might want to grab the opportunity and see if it doesn't make his life healthier and happier.
Hugs