In DC, a person can be arrested for a “Driving Under the Influence,” or DUI if their blood alcohol concentration (BAC) is .08% or higher. A DUI, or driving under the influence, is a drunk driving conviction where the BAC is above the legal alcohol limit, rendering the driver legally impaired. The legal limit in DC is as follows: Standard, non-commercial drivers: 0.08% BAC Drivers under 21: 0.01% BAC Penalties, Fines, & Suspension Penalties, Fines, & Suspension Penalty 1st offense 2nd offense 3rd offense Sentence