What is the legal blood alcohol concentration (BAC) limit for a person 21 years or older?

The legal blood alcohol concentration (BAC) limit for individuals aged 21 years or older is set at eight hundredths (0.08) of one percent. This standard is widely adopted in the United States and establishes the threshold at which a driver is considered legally impaired. This limit reflects extensive research that correlates blood alcohol levels to impairment in driving abilities, including reaction time, motor skills, and judgment.

Drivers who exceed this BAC limit face serious legal penalties, including fines, license suspensions, and possible imprisonment, as driving under the influence poses significant dangers to public safety.

Other options represent different BAC levels that may apply to specific circumstances, such as commercial drivers or younger operators, but for the general population aged 21 and over, the established limit is 0.08%.