A 25-year-old man suspected of driving a car in a drug-impaired state in Leksand on Monday afternoon.
A police patrol stopped and checked a private car where the driver showed signs of drug influence which made the patrol take him for sampling and interrogation.
The man is now suspected of driving under the influence of drugs as well as minor narcotics offenses regarding personal use.
The test results will show if the man is guilty of a crime or not.