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Microscopical Examination of Marihuana and its Alkaloidal Extracts
by Jim Dunlop of the Kalamazoo County Sheriff's Office
FRIDAY, November 18, 2016
To be held at
McCrone Research Institute
2820 South Michigan Avenue
Chicago, IL 60616
Please note: there will be a brief board meeting at 5:30pm to discuss the 2017 SMSI award recipient
6:00 PM: Thai food and beverages ~ Tariff (if eating) $15.00
Contact Freddie Smith for Reservations / Cancellations at 312-842-7100 or
by Noon THURSDAY, November 17, 2016
7:00 PM: Presentation
Since the 1930's crime laboratories have identified the marihuana plant (Cannabis sativa L.) through microscopical examination of its botanical characteristics and a secondary, chemical test employing the Duquenois-Levine reagent. Quite recently, a popular trend has developed in which the cannabinoids (chiefly THC) have been extracted from the plant material to facilitate alternate usage and trafficking methods. Many modern instruments, including GC/MS, FTIR, TLC, have been employed to analyze these extractions; however, the polarized light microscope (PLM) may be a well-suited, overlooked instrument to perform this analysis. This talk will focus on the traditional, stereoscopic and chemical examination performed to identify the plant as well as a detailed description of the illicit extraction of the alkaloids and observations made with the polarized light microscope on said extracts.
Jim Dunlop is currently a Sergeant in the Kalamazoo County Sheriff's Office - Crime Laboratory (Kalamazoo, MI) where he works as a microscopist. The majority of the cases analyzed are controlled substances; however, Jim also works on microscopical examination of trace evidence items including, but not limited to: paint, polymers, fibers, and glass.
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