There was a documentary on the Diana crash, and the reporter got his alcohol level to the same as the driver was alleged to have, which is nice work if you can get it, but the argument was, for a given alcohol level, we would all be equally as 'drunk', but we have to drink different amounts to each other to get to that level. So, some would take 4 pints, and others 20, to get to the same blood alcohol level.
Does that sound credible?
Exactly what I put earlier DMD, tolerance levels are different for every individual. Again I say if you have to drive the next day don`t go out on the lash the night before, it aint rocket science. The ambiguity is the killer in all of this. If in doubt dont drive, it really is as simple as this. They also do self testing kits now, so if you really want to get a few down you the night before, and are unsure have one on standby to see if you are safe to drive. Those that think they will be safe because they have had a nights sleep run the risk every time, despite having a belly full the previous evening, or in some circumstances it doesn`t even need that.