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Question:

It is illegal to drive in Maryland if your blood alcohol concentration (BAC) is

A 0.08% or higher.
Explaination

You are considered legally intoxicated if your blood alcohol concentration (BAC) is 0.08% or higher. (Note: An average 180-pound man will reach a BAC of 0.10% after just three standard drinks before his liver can start to break down the alcohol. One standard drink equals 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of hard liquor.)