This project was supported by the National Institute on Drug Abuse (contract number N01DA-5-7746).
Potency Trends of Δ9-THC and Other Cannabinoids in Confiscated Cannabis Preparations from 1993 to 2008*
Article first published online: 4 MAY 2010
© 2010 American Academy of Forensic Sciences
Journal of Forensic Sciences
Volume 55, Issue 5, pages 1209–1217, September 2010
How to Cite
Mehmedic, Z., Chandra, S., Slade, D., Denham, H., Foster, S., Patel, A. S., Ross, S. A., Khan, I. A. and ElSohly, M. A. (2010), Potency Trends of Δ9-THC and Other Cannabinoids in Confiscated Cannabis Preparations from 1993 to 2008. Journal of Forensic Sciences, 55: 1209–1217. doi: 10.1111/j.1556-4029.2010.01441.x
- Issue published online: 1 SEP 2010
- Article first published online: 4 MAY 2010
- Received 15 May 2009; and in revised form 14 July 2009; accepted 31 July 2009.
- cannabichromene (CBC);
- cannabidiol (CBD);
- cannabigerol (CBG);
- cannabinol (CBN);
- forensic science;
- gas chromatography-flame ionization detection (GC-FID);
- tetrahydrocannabivarin (THCV);
- Δ9-tetrahydrocannabinol (Δ9-THC)
Abstract: The University of Mississippi has a contract with the National Institute on Drug Abuse (NIDA) to carry out a variety of research activities dealing with cannabis, including the Potency Monitoring (PM) program, which provides analytical potency data on cannabis preparations confiscated in the United States. This report provides data on 46,211 samples seized and analyzed by gas chromatography-flame ionization detection (GC-FID) during 1993–2008. The data showed an upward trend in the mean Δ9-tetrahydrocannabinol (Δ9-THC) content of all confiscated cannabis preparations, which increased from 3.4% in 1993 to 8.8% in 2008. Hashish potencies did not increase consistently during this period; however, the mean yearly potency varied from 2.5–9.2% (1993–2003) to 12.0–29.3% (2004–2008). Hash oil potencies also varied considerably during this period (16.8 ± 16.3%). The increase in cannabis preparation potency is mainly due to the increase in the potency of nondomestic versus domestic samples.