I agree that it should be none and the law should be changed to reflect it but if I've ever been tempted, I think take a few moments to consider the implications of getting pulled over. Once your nicked, you carry the bad name of a Drink Driver, you struggle to get insured and for those who will insure you, your pay multiples of what you paid before. Many insurance companies don't just ask if you've been convicted of DD in the past number of years, they ask if you've EVER been convicted. Then there is the hassle of getting around without your motor. Add on the embarressment of going to court, explaining to your family, friends and work colleagues why you can't drive. And then there's the possible implications you could cause to other people by doing do. Crashing, hurting, possibly killing innocent people just cos you thought it was easier to do so.
And if that doesn't put you off, then think how you'd get by not being able to drive your Lex for 12, 24, however many months!!!!!!