thread drift but:
If you actually look at real risk and real statistics and not daily mail propoganda then actually, yes the limo driver (and all professional drivers) should have zero alchohol limit and yes, should be dobbed in.
To my recollection there has not been a single commercial aviation fatality anywhere in the world, ever due to alcohol, wheras in the UK alone last year 3000 people died on the roads with 10,000s more seriously injured, of which 1/4 to 1/3 were due to alchohol, Including a National Express coach driver.
I'm certainly not condoning drinking before a flight and indeed anyone that does so should get the full force of the justice system, but if anyone wants to play vigilante then start looking where the damage is being done by people drinking when they shouldn't. May I suggest the roads, hospitals and police stations as a more worthwihle crusade than airports.