How do you stop him drinking and driving?

Sounds easy doesn't it? I've tried them all, hiding the keys, going away and taking them with me, telling him directly he should not be driving, buying him a breathalyser, invoking killing a child and praying the neighbours will dob him in it.

He thinks that having had 10 hours sleep he is fine, maybe he is but after the sustained drinking of the last 48 hours, I am sure he can't be.

I have considered having the car fitted with a device which requires you to breathe into a device before you can start it and informing the police but unfortunately both of these are likely to destroy my marriage.

The trouble is he is physically a big man and very persuasive with it.