Adv Clin Exp Med
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To evaluate the prevalence of medicines and psychoactive substances in the blood of drivers. ⋯ In the group of psychoactive substances most often used, either alone or in combination with other agents, there were tetrahydrocannabinols, whose high percentage of positive results in drivers stopped for a roadside control may be explained by commissioning studies on early screening. Concentrations of the substances in most cases did not exceed toxic levels. Roadside examinations, on the basis of their alcohol-like effect, were performed primarily on male drivers.