What is the legal limit on BAC for a person over 21 driving? How many ounces are in a standard drink of liquor?

0.08%; 0.02%

Explanation:

Within the United States of America the legal limit on Blood Alcohol Concentration for someone over the age of 21 is that of 0.08%. Since drinking under the age of 21 is illegal in the united states, it is illegal for someone under the age of 21 to be more than 0% with some states widening the gap to 0.02%. One 12 Oz. beer, or 5 Oz. of wine, or 1 1/4 Oz. of 80 proof spirits, all contain approximately 1/2 Oz. of pure ethyl alcohol, which will normally raise your BAC (depending on individual weight and size) by 0.02%