Revised April 2020
Under contract with NIDA, the National Center for Natural Products Research (NCNPR) located at the University of Mississippi (UM), conducts analyses to monitor the potency of cannabis products distributed in the illegal marijuana marketplace in the United States. Samples are submitted for analysis by the Drug Enforcement Administration (DEA) and by state and local police agencies. Samples tested in the laboratory are classified into one of three categories: cannabis (plant material), hashish (dried resin), and hash oil (cannabis extract). Each sample is analyzed by gas chromatography for the major psychotropic component, delta-9-tetrahydrocannabinol (THC), as well various cannabinoids, including cannabidiol (CBD). The data below reflect the percentage of THC and CBD in the cannabis samples seized by the DEA from 1995-2018 and analyzed as of December 22, 2019. 'Year' indicates the year of seizure, not the date of receipt or analysis by NCNPR.
|Year||No. of Samples||THC %||CBD %|
Delta-9-tetrahydrocannabinol (THC) and Cannabidiol (CBD) Potency of Cannabis Samples Seized by the Drug Enforcement Administration (DEA), Percent Averages from 1995-2018. Source: Potency Monitoring Program, Quarterly Report # 142, NIDA Contract Number: N01DA-15-7793
Emerging Trends & Alerts
Get more information on Emerging Trends and Alerts, we will update this page with the latest research findings as they develop.
Get this Publication
Cite this article
NIDA. (2020, April 1). Marijuana Potency. Retrieved from https://www.drugabuse.gov/drugs-abuse/marijuana/marijuana-potency
Explores the latest research on marijuana, including the scope of marijuana use in the U.S., health consequences, its effects on every-day activities, available treatments.
Find information about addiction and mental health services in your area. You can search by state or zip code online or call the number. (SAMHSA)