It is illegal for a person 21 years of age or older to operate a vehicle with a blood alcohol concentration (BAC) of _____ or higher.
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0.10%
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0.05%
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0.08%
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0.03%
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Explanation
It is illegal for any person 21 years of age or older to operate a vehicle with a blood alcohol concentration (BAC) of 0.08% or higher. Alcohol impairs a person's ability to safely operate a vehicle, so the legal limit of 0.08% or higher is set to ensure that all drivers are not impaired while operating a vehicle.
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This question appears in the following DMV practice tests: