"...The blood alcohol test is a very poorly implemented standard since the amount of alcohol that affects each person will vary..."

That is very true. CA has a blood alcohol limit of .08%. I have arrested drunks that, based on the field sobriety test, I guessed were maybe a .15%, then a test showed them to be over .30%. Long time drinkers for sure.

The "average" person will burn off .02%/one ounce of alcohol every hour. So theoretically you can drink one mixed drink/can of beer, wait 60 minutes, and your BAC will be zero...