What is DUI?

DUI is short for Driving Under the Influence. A person is guilty of DUI if he or she drives or physically controls a motor vehicle while under the influence of alcoholic beverage, chemical, or controlled substance to a degree which renders him or her incapable of safely driving. A person is "under the influence" if his or her mental faculties are impaired by alcohol or controlled substances, or his or her blood alcohol concentration (BAC) is above the legal limit of .08%, at which BAC a motorist is presumed to be impaired.