Samenvatting

In 2018 we published a report on the production of synthetic drugs in the Netherlands. We calculated the turnover of synthetic drugs produced in the Netherlands in 2017; we estimated it to be at least 18.9 billion euro (worldwide, street prices). In this article, we will discuss how these calculations were executed and on which assumptions they were based. We describe the responses to these calculations, nationally and internationally. Finally, we describe problems we encountered when performing a repetition of the calculations for the year 2018. Our central message is: drug turnover calculations can be an important addition to scientific and political discussions about illicit drugs, provided they are presented in a transparent way and acknowledging the inherent limitations of these calculations.