A man in his 25-year-old is suspected of having driven a passenger car in a drug-impaired state.
A police patrol stopped and checked a car in Skoghall late on Monday morning.
The driver showed signs of drug influence, which made the patrol take him in for testing and questioning. He is suspected of drug driving and minor drug offenses related to personal use.
The test results will show whether the man is guilty of the crime or not.