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Barry Liskow, MD
St. Louis

JAMA. 1970;214(9):1709.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.—

Rodin et al (JAMA, 213:1300, 1970) expressed dismay that the marihuana they received from the National Institute of Mental Health "was supposed to have had a A^9-THC [tetrahydrocannabinol] content of 1.312%. When samples of the same material were sent for assay to two independent laboratories, A^9-THC contents of 0.5% and 0.2%, respectively, were reported. This indicates that the current assay techniques are either quite unsatisfactory or the material deteriorates merely by standing in a safe at room temperature." In a recent paper,¹ Lerner demonstrated that the THC content of marihuana at room temperature decreases at the rate of 3% to 5% per month, and, that at 100 C for one month, all THC in a potent marihuana sample (2.32% THC) had disappeared. As pointed out by Lerner, because of the long-known decrement in the psychoactive potency of marihuana (now known to . . . [Full Text PDF of this Article]

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