Help!

To FIL has been driving and driving. Drinking to the point that he can’t can’t and when he talks you can’t understand him. I never catch him in his car, i always hear him come home drunk as hell. He will end up killing someone! He isn’t going to listen, he will continue to do so. My husband is no help because he continues to make excuses for him & im tired of that. Fuck that! Is there any way I can report him to the police even if he’s not in the car physically driving?