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The legal blood alcohol concentration (BAC) limit for drivers over 21 in most states is 0.08%. This threshold is established to enhance road safety and reduce alcohol-related accidents. When a driver's BAC reaches this level, they are considered impaired and subject to legal penalties, including fines, license suspension, and even jail time in severe cases.

It's important to note that while some states may have stricter limits for certain drivers, such as commercial drivers or those under 21, the 0.08% limit is widely accepted for the general adult population. This standard also serves as a clear point to help law enforcement determine intoxication levels during traffic stops, which leads to more effective enforcement of DUI laws.