Accidents Support Group
This community is dedicated to helping members recover from accidents and unexpected events that have caused emotional and/or physical distress. Some examples of accidents that can cause long-term stress include: Aircraft Accidents, Bicycle Accidents, Car and Motorcycle Accidents, Train accidents, Nuclear accidents, Ship accidents, Workplace accidents.

I dont know what the laws are like where you live, but this is not only the legal issue but an ethical issue as well. Idk if i could live with my self if my husband killed a family in another vehicle and i knew that he is drinking.
Sounds like you tried to do something abut it but it's not easy.
I guess if i was in this situation i would probably think that i would lose him anyway either to prison, death or liver cirrhosis, so i d probably go to local police and do whatever it took to get him off the road and demand that he goes to rehab facility.
It is easier said than done, i just hope you can help him..
Alcoholism is a terrible disease, but sometimes it works.
If he ever goes to court for his violations, push for mandatory detox and rehab.