Figure 2From: Drug Checking: A prevention measure for a heterogeneous group with high consumption frequency and polydrug use - evaluation of zurich's drug checking servicesPolydrug use during a typical party night (n = 1042). The majority of the evaluated subjects reported consumption of various substances during a typical party night. Figure 2 shows the trend of polydrug use from 2004 to 2009, which decreased on average by 13.0%.Back to article page