What is the legal blood alcohol concentration (BAC) limit for individuals over the age of 21?

The legal blood alcohol concentration (BAC) limit for individuals over the age of 21 is .08%. This standard is widely recognized across many states in the U.S. and is the threshold at which a driver is considered legally impaired. Driving with a BAC of .08% or higher can lead to serious legal consequences, including fines, license suspension, and potential jail time.

Setting the limit at .08% is based on research which indicates that impairments in driving ability start to become significant at this concentration, affecting reaction time, coordination, and decision-making skills. The aim is to promote safer driving conditions and reduce the incidence of alcohol-related accidents on the road.

The other options present BAC limits that either do not align with current legal standards for individuals over 21 or are set at levels that are not recognized as legal limits for driving under the influence.