What is blood alcohol concentration? What is the legal limit in North Carolina?
Blood alcohol concentration is a measure of the amount of alcohol present in a person’s bloodstream. Considering a person’s blood alcohol concentration is the most common way courts determine whether or not a person is legally impaired. For DWI purposes, a person’s blood alcohol concentration can be expressed in either grams of alcohol per 210 liters of breath, or as grams of alcohol per 100 milliliters of blood. In North Carolina, the legal limit for most drivers is .08 and you are considered impaired if the state can prove that your blood alcohol concentration was .08 or greater at any relevant time after driving, and the BAC is based on alcohol consumed before or while driving the vehicle. So for drivers less than 21 or those operating a commercial motor vehicle, it is illegal to drive while any alcohol remains in the driver’s blood. And if operating a commercial motor vehicle, you are considered legally impaired if your blood alcohol concentration is only .04.