Journal Pre-proof Mix of new substances psychoactive, NPS, found in blotters sold in two Colombian cities Catrin Y. Mendoza-Valencia (Conceptualization) (Methodology) (Validation) (Investigation) (Writing - original draft), Diana Jazm´ ın Mari˜ no Gaviria (Investigation) (Supervision) (Writing - review and editing) (Visualization), Nancy Pati˜ no Reyes (Supervision), Fabian Lopez-Vallejo (Writing - review and editing), ´ Alvaro Emilio Sarmiento Guti ´ errez (Data curation) (Software) (Validation), Daniel Trespalacios Rodr´ ıguez (Methodology) (Validation) PII: S0379-0738(19)30381-0 DOI: https://doi.org/10.1016/j.forsciint.2019.109969 Reference: FSI 109969 To appear in: Forensic Science International Received Date: 24 June 2019 Revised Date: 20 September 2019 Accepted Date: 27 September 2019 Please cite this article as: Mendoza-Valencia CY, Mari˜ no Gaviria DJ, Pati˜ no Reyes N, Lopez-Vallejo F, Sarmiento Guti´ errez ´ AE, Trespalacios Rodr´ ıguez D, Mix of new substances psychoactive, NPS, found in blotters sold in two Colombian cities, Forensic Science International (2019), doi: https://doi.org/10.1016/j.forsciint.2019.109969