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Question:

Which of the following statements about blood alcohol concentration (BAC) are true?

A Both a) and b) are true.
Explaination

If you drive with a blood alcohol concentration (BAC) of 0.08% or above, you are considered legally intoxicated and can be charged with driving under the influence (DUI). It is also illegal to drive with a BAC of 0.04% or above if you are operating a commercial motor vehicle (CMV) such as a bus or truck. It is also illegal to drive with a BAC of 0.02% or above if you are under 21 years of age. An average 180-pound man will reach a BAC above 0.02% from drinking just one 12-ounce can of beer before his body starts to break down the alcohol. Hence, for drivers under 21, a BAC limit of under 0.02% is effectively zero tolerance.