“…These mainly include synthetic stimulants, depressants, hallucinogens, and cannabinoids (EMCDDA, 2017;Nelson, Bryant, & Aks, 2014), but some plant-based drugs may also be classified as NPS (Schifano, Orsolini, Duccio Papanti, & Corkery, 2015). In cases where sales information or labels exist, these may be inaccurate or misleading due to intended mislabeling or adulteration of common drugs with NPS (Oliver et al, 2019;Palamar et al 2017;Scherbaum, Schifano, & Bonnet, 2017;UNODC, 2016) or the chemical name may be difficult to remember. Hence, even when reporting to the best of their knowledge, users may still do so incorrectly.…”