PharmacyPharmaceutical AnalysisAnalytical ToxicologyChromatographic AnalysisForensic Pharmaceutical AnalysisControlled Substance AnalysisDrug ImportationCannabis ClassificationGeographical Origin DeterminationIllicit Drug DetectionIllicit Drug IdentificationReference Collection AnalysisReference Collection BuildingReference Collection CurationVisual Inspection
Samples taken from seizures of illicitly imported cannabis and cannabis resin of known geographical origin have been examined by thin-layer chromatography. The chromatographic characteristics were considered in conjunction with the gross physical appearance of the materials and it was found possible to discriminate between samples of different origin. Thus by carrying out thin-layer chromatography and a visual inspection on a sample of unknown provenance, an opinion as to its geographical origin can be offered. Extensive use is made of a reference collection of samples.