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Question:

In Idaho, if you are 21 years of age or older, a blood alcohol concentration (BAC) of ________ or higher will result in a charge of driving under the influence (DUI).

A 0.08%
Explaination

In Idaho, a driver who is 21 years of age or older will be considered to be driving under the influence if his or her blood alcohol concentration (BAC) is at or above 0.08%. (Note that an average 180-pound man will reach a BAC of 0.10% after having consumed three 12-ounce cans of beer.) [8-6 Driving Under the Influence, Chapter 8 How to Protect Your Driving Privileges, Idaho Driver's Manual]