Okay Motley you got my point.  In the article it says the woman might reach her level of intoxication with 13 "drinks" in a 3-hour period.  Now my quantitative mind immediately asks how much alcohol this implies which is the real number that determines intoxication.  As you point out, the unit of a "drink" does not really convey meaningful information.  Somebody in the reporting chain apparently thinks the unit of a "drink" is well-defined in terms of amount of alcohol.  But thanks for the numbers.