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The aim of the present study was to investigate the composition of heroin, amphetamine, and cocaine seized in the police district of Aarhus, the second largest city in Denmark, during a 2-year period. The purity of the active substance was measured together with the frequency and purity of adulterants and diluents present in the drugs. Results are com- pared with a similar study conducted ten years earlier. The concentrations of the active substances in illicit heroin, am- phetamine, and cocaine samples have decreased significantly over a 10-year period. This finding shows that the "cutting" of illicit drugs is more prevalent and comprehensive today than it was 10 years ago. Also, the variety and quantity of adul- terants and diluents have changed over time.

Adulterants and Diluents in Heroin, Amphetamine, and Cocaine Found on the Illicit Drug Market in Aarhus, Denmark