Drug use can reduce the ability to drive a motor vehicle safely on the public road. European countries have developed various legal mechanisms to address this issue, using laws on road traffic or on drug control. This topic overview briefly describes the national laws in EU Member States and Norway, along with EU legislation, on drugs and driving. Here you can find out for each country whether the legal provisions exist in drug control laws or road traffic laws, the substances addressed, the levels of penalties, any blood-drug or impairment levels established, and whether drivers can be stopped and tested at any time or if the police require some form of suspicion beforehand.