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Estimates of the prevalence of deviant behaviour, which are based on the usual survey methods are by far too low. Therefore, the use of capture-recapture methods or of the truncated Poisson distribution is to be preferred, provided appropriate data are available. Here an extended Poisson approach was applied in order to estimate the number of users of hard illegal drugs (heroin, cocaine) in Switzerland for each year from 1990 to 1993. These estimates indicate an increase by about 50% during the period 1990-1993.

Zunehmender Heroin-und Kokainkonsum in der Schweiz seit 1990: Anwendung eines verallgemeinerten Poisson-Ansatzes auf Anzeigedaten