Weband “identify” the presence of marijuana in a seized substance solely on the basis of marijuana field tests such as the D-L. Since the D-L field test cannot identify the presence of marijuana, this raises the serious possibility of tens of thousands of wrongful drug convictions. Moreover, the DEA now claims that the D-L test does In the 1960s and 70s various studies showed that the D–L test was not specific to cannabis, although some flawed studies claimed to show the opposite. A 1969 UK government scientist reported twenty-five plant substances giving a D–L test result very similar to that of cannabis and warned that the D–L test "should never be relied upon as the only positive evidence."Another 1969 study found false positives from "a variety of vegetable extracts".

Cannabis spp. (pistillate inflorescence and leaf)

Webthe presence of characteristic plant particles, especially cystolithic hairs, glandular hairs, and resin glands. If the solution is cloudy or highly colored, gently heat the slide to clear … WebDec 6, 2006 · Together, cystolithic hairs and clothing hairs were botanical features unique to marijuana. Marijuana samples varied in color and plant-matter shape, but all genuine marijuana had cystolithic and clothing hairs. The Duquenois-Levine color test was a microchemical test used for the identification of marijuana. dickinson admitted student day

Thin Layer Chromatographic Analysis of Psychoactive Plant …

WebMay 1, 2001 · The identification of marijuana (Cannabis sativa) is a routine analysis in many forensic laboratories. An important part of this analysis is the identification of … WebJul 1, 1972 · The Examination of Cystolithic Hairs ot Cannabis and other Plants by means of the Scanning Electron Microscope - ScienceDirect Article preview Abstract … WebMay 1, 2001 · The identification of marijuana (Cannabis sativa) is a routine analysis in many forensic laboratories. An important part of this analysis is the identification of trichomes, commonly called... cit lighthouse login