Impaired driving is the leading cause of criminal death in Canada, and the #1 cause of death of Canadian youth. “Driving under the Influence” (DUI), is the term used in Canada since 1921, to describe the criminal offense of operating a motor vehicle, while the person’s ability is impaired by alcohol or drugs. “Driving While Impaired” includes: Swerving and weaving; jerky, sudden movements, failure to follow traffic signs and signals, tail-gaiting, or mishandling of vehicle equipment. The two terms can refer to the same offence, or the state you were in when you were pulled over.