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Question:

In most states including Tennessee, it is illegal to drive with a blood alcohol concentration (BAC) of ______ or higher.

A 0.08%
Explaination

In most states including Tennessee, it is illegal to drive with a blood alcohol concentration (BAC) of 0.08% or higher. In Tennessee, if you are found to be driving with a BAC this high, you can be charged with driving under the influence (DUI). [What is Blood Alcohol Concentration?; B-7. Alcohol, Other Drugs and Driving; Tennessee Comprehensive Driver License Manual]