A zero-tolerance law for driving under the influence of drugs (DUID) was introduced in Sweden in 1999. This led to a huge increase in the number of blood samples sent off for toxicological analysis and a study of 26,556 cases of DUID found that 60% of the samples contained some form of amphetamine together with either legal or illegal drugs. In just under a quarter of the cases amphetamine was the only substance found in the blood sample. 85% of the amphetamine users were men who tended to be a few years older than the women. The mean age of ecstasy users was 26 - about ten years younger than the average age of the other amphetamine users.
Jones, Alan Wayne, Holmgren, Anita and Kugelberg, Fredrik C. - Driving under the influence of central stimulant amines: age and gender differences in concentrations of amphetamine, methamphetamine and ecstasty in blood Journal of Studies on alcohol and drugs March 2008, 69(2), 202-208