By analyzing the waste using urinary biomarkers, researchers can reliably detect actual drug consumption in cities. A large group of scientists has for the first time conducted a comparative study of illegal drug consumption in 19 European cities based on wastewater analysis. The findings are published in the specialist journal Science of the Total Environment. The four Spanish cities, Barcelona, Castelló de la Plana, Santiago de Compostela and Valencia had a higher consumption of cannabis and cocaine compared with other drugs like ecstasy and methamphetamines...
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