A freshly published report from the EU drugs agency EMCDDA has used this inventive method to determine the patterns of drug use in 56 cities in 19 European countries, namely looking for concentrations of amphetamine, cocaine, MDMA (ecstasy), and methamphetamine in a city’s wasteway. This data, combined with the area’s population and the flow of water, can provide researchers with some clues about a population’s drugs habits.

via Sewer Water Reveals Which Cities In Europe Take The Most Drugs | IFLScience