Driving under influence

Driving under the influence, drink-driving, drunk driving, or drinking and driving is the act of operating a motor vehicle after having consumed alcohol (ethanol) or other drugs, to the degree that mental and motor skills are impaired. It is illegal in most jurisdictions. Several anti-drink-driving advertising campaigns have aimed to raise awareness of the legal situation and the dangers of driving while intoxicated. Drink-driving is responsible for a very large number of deaths, injuries, damage and accidents every year. The specific criminal offence may be called, depending on the state, driving while intoxicated (DWI), operating while intoxicated (OWI), operating a motor vehicle while intoxicated (OMVI), driving under the influence [of alcohol or other drugs] (DUI), or drunk in charge [of a vehicle]. Such laws may also apply to boating, or piloting aircraft.
Guilt may be established by subjective tests of the driver's impairment, or measurement of his blood alcohol content (BAC). This is expressed in terms of milligrams of alcohol per millilitres of blood, or as a percentage. (10 mg/100 ml = 0.01 g/100 g = 0.01 %).