As is often the case in these kind of things though, the baby tends to get thrown out with the bathwater, and the sensible drinker with a clean licence can end up on the wrong side of a drink driving conviction.

In Norway, they brought it down to 20/1000 a number of years ago.
Now, I haven't drank alcohol in many many years, and I was stopped on the road out of Oslo one afternoon, driving up the country for a gig.
The only things I had in my system was about 3 litres of coffee, a few glasses of squeezed orange juice, and about 5 or 6 cloves of garlic, as I was absolutely dying with the flu at the time.
But sober as a judge as far as legal/illegal substances were concerned.

I failed the breath test, and it was in no small part due to the 'corroborative evidence' of my then girlfriend that I was begrudgingly let go instead of being brought handcuffed to a hospital where they would have taken a blood sample.

When the policeman was finally 'convinced' that I had been telling him the truth all the time, I asked him why my reading should have turned up such results.

"It must have been the orange juice....,", he said "... perhaps the garlic."

"Ahh," I said. "... a little alcohol, orange juice, and garlic tester..., all in one wee box. Isn't technology wonderful, all the same? Good day, Constable"

B.