Driving Under the Influence (DUI) and Driving While Ability Impaired (DWAI) are serious offenses designed to keep our roads safe, but many people misunderstand what constitutes impairment. You don’t have to be ‘drunk’ or ‘drinking’ to be under the influence — prescription drugs, marijuana, or even over-the-counter medications can impair your ability to drive. In fact, Colorado law presumes you’re ‘under the influence’ with a blood alcohol content of 0.08%, and ‘ability impaired’ with a BAC of 0.05%. To stay safe, always plan ahead if you intend to drink or take medications that could impair your driving.