I have been stopped and breathalyzed by the Police several times after consuming 2 or 3 pints of beer, or the equivalent amount of wine, over a long day with a meal (typical golf day?!), and either registered zero or just off the bottom of the scale. So the rate at which you drink and the rate at which your body eliminates alcohol (i unit per hour) should be be taken into consideration, not just don't drink more than x units. Tipping 2 pints down your neck just before closing time and then driving home is definitely not sensible! :mmm:
