Idaho Written Driver's License Practice Test 2025 – The All-in-One Guide to Exam Success

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What is the legal blood alcohol concentration (BAC) limit for drivers 21 years and older in Idaho?

0.02%

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0.08%

In Idaho, the legal blood alcohol concentration (BAC) limit for drivers who are 21 years old and older is set at 0.08%. This means that a driver is considered legally impaired if their BAC is at or above this level.

The rationale behind this standard is based on extensive research showing that at a BAC of 0.08%, individuals exhibit significantly impaired judgment, coordination, and reaction times, which can lead to an increased risk of accidents. This threshold is consistent with many states in the United States, reflecting a broad consensus aimed at promoting road safety.

For drivers under the age of 21, Idaho has a zero-tolerance policy, establishing a BAC limit of 0.00%, emphasizing the importance of sobriety for younger, less experienced drivers who may be more susceptible to impairment from alcohol.

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