Assumptions .... (obviously, it is necessary to have data. I estimated and approximated where data was not provided)
The volume of blood in the average male body is approx 75ml per KG of body mass.
1 drink of normal beer is 480ml at 5% abv (1 pint). There are 24ml of alcohol in this drink.
1 drink of strong barleywine/quad beer is 480ml at 13% abv (1 pint) There are 62.4ml of alcohol in this drink.
150 pounds is about 68KG.
So, a 150 pound male has around 5100ml of blood in their body.
If somehow magicly 100% of all the alcohol hit the bloodstream at the same time ...
Drinking 1 pint of 5% abv beer will resurt in a BAL of 0.047 ... or less than .08.
Drinking 1 pint of 13% abv beer will resurt in a BAL of 0.12 ... or greater than .08.
12 oz of beer is approx 355ml. (can or bottle normal size.) at 5%, you are talking about 17.5ml of alcohol.
100% alcohol absorbed into 5100ml of blood would result in a BAL of 0.034
If you mean "a shot" or mixed drink by 1 drink .... then for every 1oz of 80 proof vodka or rum you have approx 12ml of alcohol.
Each 1oz of 80 proof liquor would dillute to approx .024BAL ....
The only way 1 drink will get your BAL over .08% if you are a male who weighs about 150 pounds is if you have very little blood, or if you drink a very strong drink.
In general, it is not theoretically possible to get your BAL over .08% with 1 drink, as there simply is not enough alcohol in the single drink.
That said ....
Everybody has different tolerances.
One person may feel "perfectly normal" with a BAL of .06 while somebody else might be "buzzing" with a BAL of .03 .....
So .... be responsible. If you drink, don't drive. If you have 1, and feel "normal", then you're probably OK, but don't take any stupid risks ....
Edit --> Corrected my incorrect math. (I was off by a factor of 10.) Not good
