What is the blood alcohol content (BAC) limit for drivers over 21 in most states?

The blood alcohol content (BAC) limit for drivers over 21 in most states is set at 0.08%. This standard is widely recognized in the United States and serves as a legal threshold; driving with a BAC above this limit is considered illegal and can result in severe penalties, including fines, license suspensions, and even jail time.

The 0.08% BAC limit is based on research that indicates this level is associated with a significant decline in driving ability, impacting motor skills, reaction time, and decision-making. This makes it an important regulation aimed at improving road safety. Different states may have lower limits for specific drivers, such as commercial drivers or those under 21, but for the general adult population, the 0.08% limit is the norm.