Hi kat
The court will not like the fact that this is now your B-in-law's third offence of DD, so he could be looking at a cust.sentence.
What would have happened had he come across someone, even a child, crossing the road when he's drunk at the wheel?
Or ploughed into someones car injuring them badly
I have no sympathy for people like your B-in-law and maybe in future he'd think about before he gets in a car to drive it.
I wont wish him luck that he gets away with a fine or ban, and maybe they should make an example of him with a hard sentence.