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Driving under the influence of illicit drugs, as well as some legal substances, is against the law internationally (WHO, 2016). To prevent such risky behaviour, Spain is one of the… Click to show full abstract
Driving under the influence of illicit drugs, as well as some legal substances, is against the law internationally (WHO, 2016). To prevent such risky behaviour, Spain is one of the European Union countries with a zero tolerance policy, where driving with any amount of drugs in the body is illegal. Roadside drug screening or testing is mandatory (the law penalises all those who refuse to undergo such tests believing they would turn out positive), and are performed on oral fluid. When a driver tests positive, a second sample of oral fluid is obtained and sent to accredited laboratories for confirmation and quantification analysis of the detected substances.