Drinking and driving is taken very seriously in Alabama. If you are operating a vehicle with a with a blood alcohol concentration or BAC of .08% or above you are committed a DUI (driving under the influence) or DWI (driving while intoxicated). Offenders will face harsh punishments from the state courts and the department of public safety. Additionally, all DUI offenders are required to complete a substance abuse program. Legal limit in Alabama: Standard, non-commercial drivers: 0.08% BAC Commercial drivers: 0.04% BAC Drivers under 21: