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marijuana
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marijuana plants
The chemistry of marijuana
saliva test for cannabis
The legality of marijuana in the United States medical cannabis: CanniMed Marijuana (Cannabis sativa) with (left) male plant, (right) female plant
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The chemistry of marijuana
Learn about the chemistry of marijuana and how its potency and safety is determined.
Video: © American Chemical Society (A Britannica Publishing Partner)
saliva test for cannabis
Saliva testing for cannabis could someday help identify impaired drivers.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

marijuana plants
Marijuana (Cannabis sativa).
John Kohout—Root Resources/Encyclopædia Britannica, Inc.
The legality of marijuana in the United States
Encyclopædia Britannica, Inc./Kenny Chmielewski
medical cannabis: CanniMed
Cannabis plants cultivated for the standardized cannabis product known as CanniMed,...
Courtesy of Prairie Plant Systems
Marijuana (Cannabis sativa) with (left) male plant, (right) female plant
H. Matsuura--B.W. Halstead, World Life Research Institute
VIEW MORE in these related Britannica articles: