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Wastewater reveals drug consumption picture

In 2013, wastewater samples from European cities were tested for drug traces for the third time. Basel, Berne, Geneva, St. Gallen and Zurich were among the 42 cities which took part in the study. Over the course of a week, the wastewater of around 1.4 million people in Switzerland was tested for cocaine, amphetamine, crystal meth and ecstasy. Results showed differences between cities, and between weekends and weekdays.
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