Not sure that would work up4it (plus that is a terrible suggestion to make).
The police are able to forensically backtrack (using blood samples) the alcohol levels in your blood. Not sure exactly how it works, but at the end of the day, drink driving is incedibly wrong, and we can only hope that the people who do it crash their cars in very remote parts of the country, only killing themselves and damaging their property - I can suggest some fantastic places if people want to try this out