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Preservation of Cannabis

Carlton E. Turner, PhD; Kathy Hadley
JAMA. 1973;223(9):1043-1044. doi:10.1001/jama.1973.03220090063024.
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To the Editor.—  As suppliers of Cannabis sativa L (marihuana) for the National Institute of Mental Health (NIMH), we would like to clarify pertinent questions in regard to the analysis of C sativa L. Rodin et al (213:1300, 1970) expressed dismay at the cannabis material he received from the National Institute of Mental Health. Two independent laboratories obtained a different percentage of (-) -△9-trans-tetrahydrocannabinol than was reported by the NIMH. Additionally, Liskow (214:1907, 1970) has stated that Dr. Braenden of the United Nations recommended that C sativa L be frozen under nitrogen to avoid deterioration. We would like to make the point emphatic that it is not necessary to use such strenuous conditions for the storage of cannabis. Results from a two-year storage study on C sativa L under several conditions follow: (1) —18 C in the freezer; (2) 4 C in the refrigerator; (3) 22 plus or minus


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