I take the opposite view, Smokey.

If I have the legal limit of alcohol, I am perfectly capable of driving both my mouth and my car.

It may be unpalatable to some, but the fact is that some people with the legal limit of alcohol in their bloodstream still have faster reactions than some people with zero alcohol in their bloodstream.

I have proved this many times, just download some of the thousands of internet reaction test programs out there and try it for yourself.

The current UK limit works out at 1.5 pints of ABV = 3.7% as far as I can work it out.

Unacceptable politically, but irrefutable logically, and totally feasible to implement, would be a scheme whereby everybody gets their own allowable bloodcount.

Me, I would guess my acceptable limit to work out at 2.5 pints of Harveys ...YMMV