Published: Journal of Analytical Toxicology, Volume 21, Number 4, July/August 1997, pp. 283–285.
A Positive Cannabinoids
Workplace Drug Test Following the Ingestion of Commercially
Available Hemp Seed Oil
R.E. Struempler, G. Nelson,
and F.M. Urry
A commercially available health food product of cold-pressed hemp seed oil was ingested by one volunteer twice a day for 41/2 days (135 mL total). Urine specimens collected from the volunteer were subjected to standard workplace urine drug testing procedures, and the following concentrations of 11-nor-9-tetrahydrocannabinol carboxylic acid (9-THCA) were detected: 41 ng/mL 9-THCA at 45 h, 49 ng/mL at 69 h, and 55 ng/mL at 93 h. Ingestion was discontinued after 93 h, and the following concentrations were detected: 68 ng/mL at 108 h, 57 ng/mL at 117 h, 31 ng/mL at 126 h, and 20 ng/mL at 142 h. The first specimen that tested negative (50 ng/mL initial immunoassay test, 15 ng/mL confirmatory gas chromatographic–mass spectrometric test) was at 146 h, which was 53 h after the last hemp seed oil ingestion. Four subsequent specimens taken to 177 h were also negative. This study indicates that a workplace urine drug test positive for cannabinoids may arise from the consumption of commercially available cold-pressed hemp seed oil.
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