I'd like to know where do you believe that research should be directed. In this recent review the authors state that most of the research in the NPS field is based on case reports and surveys, lacking prospective data and analytically confirmed reports
Mdege, N. D., Meader, N., Lloyd, C., Parrott, S., & McCambridge, J. (2017). The Novel Psychoactive Substances in the UK Project: empirical and conceptual review work to produce research recommendations. Public Health Research, 5(4), 1–138. http://doi.org/10.3310/phr05040
IMO, I'd like more information characterizing the frequency of positive and negative effects in certain NPS.
Mdege, N. D., Meader, N., Lloyd, C., Parrott, S., & McCambridge, J. (2017). The Novel Psychoactive Substances in the UK Project: empirical and conceptual review work to produce research recommendations. Public Health Research, 5(4), 1–138. http://doi.org/10.3310/phr05040
IMO, I'd like more information characterizing the frequency of positive and negative effects in certain NPS.