Detectability of cannabinoids in the serum samples of cannabis users: Indicators of recent cannabis use? A follow-up study Posted on February 11, 2022February 11, 2022 By Becky Carter Michael Krämer, Martin Schäper, Kristina Dücker, Alexandra Philipsen, Moritz Losacker, Nadine Dreimüller, Jan Engelmann, Burkhard Madea, Cornelius Hess Drug Testing and Analysis; 13(9); 2021 Access article DREs / Traffic Safety Resource Prosecutors, Seized Drugs/Controlled Substances, Toxicology