Drunk driving in Sweden is defined by a level of alcohol in the blood (BAC) equal or abovel 0.2 per mille, meaning 0.2 milligrammes of alcohool per litre of blood. This is equivalent to 0.1milligramme per litre of breath, as measured by breathalyzers used by the Swedish police. Drunk drivers in Sweden are punishable by fines or imprisonment for up to 6 months and by using an alcolock on their car for 1 to 2 years. Failure to install an alcolock on the car lead to livence revocation. Aggravated drunk driving is defined by a BAC above 1 per mille, corresponding to 0.5 milligramme per litre of breath. Aggravated drunk driving can result in imprisonment up to two years, and using an alcolock for two years.

Blood testing is done regularly during the period of use of the alcolock to verify abstinence, which is a condition for getting back a full driving licence.

Same rules apply for boat driving, and controls are regularly done, in particular for small motor boats used in Stockholm city.