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Question:

A driver with a blood alcohol concentration (BAC) of ______ or above is considered mentally and physically impaired.

A 0.08%
Explaination

A driver with a BAC of 0.08% or above is considered mentally and physically impaired whether or not he or she shows it. [Drunkenness is Not Always Apparent; Alcohol the Major Cause of Crashes; How Alcohol and Drugs Affect You and Your Ability to Drive; Wyoming Rules of the Road]