By Brian Bienkowski – Environmental Health News

Drug users might be less than forthright about their illicit habits—but they all have to pee. With that in mind, scientists are drug-testing entire sewer systems to study just how popular illegal drugs have become.

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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/E0df2DzDWmU/meth-in-london-heroin-in-zagreb-the-answer-is-found-i-1508209127