It is illegal for a person 21 years of age or older to drive with a minimum blood alcohol concentration (BAC) of:
For drivers age 21 or older, it is illegal to operate a motor vehicle with a blood alcohol concentration (BAC) of 0.08 percent or higher. Driving while under the influence of alcohol is not only illegal, but dangerous.
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This questions appears in the following tests:
Colorado Practice test 9
Colorado Practice test 18