The words driving while intoxicated (DWI) or driving under the influence (DUI) are often used synonymously. Usually, when people use either phrase, they default in their minds to drunk driving, and massive amounts of money have been spent on trying to educate people on the dangers of getting behind the wheel after having alcohol.
DWI and DUI are not limited to impairment by alcohol. Drugs and other illegal substances also are included, and driving while under the influence of narcotics like marijuana is as much a crime as driving while drunk.
How the Law Differs