Cannabis sativa L. (Marijuana). VII. The relative specificity of the RIM test

A total of 526 non-marijuana plant samples representing 427 different plant species were subjected to the RIM test (Rutgers Identification for Marijuana test). Although a few samples gave Fast Blue B reactive spots when examined by thin-layer chromatography, the spots could easily be distinguished from the marijuana cannabinoid spots. No plants were found to exhibit false positive results and hence the method is considered to be relatively specific for marijuana.