When I was in Germany in the Army, their law was harsh. First offense drunk driving, lose license for LIFE. But, drinking and driving almost never, ever happened.
There is absolutely NO reason to drink and drive if you are even marginally responsible.
Having said that, I have no idea what is in his contract, what the Athletic department rules are, etc. I say he gets what ever is spelled out in the terms of all relevant laws, documents and guidelines. Nothing more, and nothing less. I suspect he'll be let go, which will suck for the program a s whole, but is the right thing for player / person development and perception.