In the UK there is a widely held belief that a couple of pints will put you over the limit, 80mg of alcohol per 100ml of blood. That same limit exists in America, where your average Joe will say 'err - the limit is probably about 8 or 9 beers'. At first I thought to myself - wow - Americans are stupid. But then I spoke to a doctor, who said that most of the stuff in the press was rubbish. He pointed me to webMD. http://www.webmd.com/mental-health/alcohol-abuse/blood-alcohol?page=2 FYI normal liquor is 40% ABV, 1.5fl oz is about 44ml = 1.77 UK units, so working on that basis you'd have to drink about 8 pints of normal beer in a 3 hour pub session to be over the current limit. Evidence I have for this probably being correct: -A doctor told me so -My former boss (who would never BS) bought an ~ £200 breathaliser said that to blow a .08 he had to be very hammered indeed -This Tucker Max story (read it just for the hilarity) http://www.tuckermax.com/archives/entries/date/the_famous_sushi_pants_story.phtml#277 -One of my friends got hit by a driver in Hampshire who was apparently so drunk that he couldn't stand up straight and kept dropping his keys, yet the Police told him the next day that by the time he was breathalised at the station he was below the level at which they could prosecute (which I think is 0.088). Not many men are that 'drunk' after a couple of pints Evidence I have for this probably being optimistic: -The widely held belief in the UK that the drink drive limit is just over a pint -Articles like this which say the drink drive limit is currently about 1.5 pints http://www.timesonline.co.uk/tol/driving/article7061168.ece So who's right? It's very confusing. I think I am going to bite the bullet and buy a proper breathaliser for myself - it's the only way to be sure.