If you are at least 21 years old and your alcohol concentration (AC) is ______ or above, you are considered legally under the influence of alcohol.
Explanation
You are considered legally under the influence of alcohol if either (1) you are at least 21 years old and your alcohol concentration (AC) is 0.08% or above; or (2) you are under 21 and your AC is 0.02% or above. If you're convicted of driving under the influence, you may face harsh penalties.
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