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Study Finds Hemp Seed Oil Causes a Positive Drug Test

A new study has found that commercially available hemp seed oil products applied to hair can cause a positive result for cannabinoids on a hair follicle drug test.

The researchers conducted hair follicle drug tests on participants who had applied hemp seed oil to their hair for 6 weeks, NORML reported. The hemp seed oil did not contain detectable levels of THC and all participants declared they had not used or been exposed to cannabis.

“Application of hemp oil to hair resulted in the incorporation of one or more cannabis constituents in 89% of volunteers, and 33% of the group tested positive for the three major constituents, THC, CBN [cannabinol] and CBD [cannabidiol],” the researchers stated.

They also stated, “It is of concern that cannabinoids have been detected in hair samples following the application of hemp oil as a cosmetic procedure, and at levels in our study relevant to suggest cannabis exposure in some cases. … We suggest that cosmetic use of hemp oil should be recorded when sampling head hair for analysis, and that the interpretative value of cannabinoid hair measurements from people reporting application of hemp oil is treated with caution in both criminology and public health.”

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A positive cannabinoids workplace drug test following the ingestion of commercially available hemp seed oil

Affiliation

  • 1 ARUP Laboratories, Inc., Salt Lake City, Utah 84108, USA.
  • PMID: 9248945
  • DOI: 10.1093/jat/21.4.283

A positive cannabinoids workplace drug test following the ingestion of commercially available hemp seed oil

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Authors

Affiliation

  • 1 ARUP Laboratories, Inc., Salt Lake City, Utah 84108, USA.
  • PMID: 9248945
  • DOI: 10.1093/jat/21.4.283

Abstract

A commercially available health food product of cold-pressed hemp seed oil ingested by one volunteer twice a day for 4 1/2 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-delta9- 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.

A commercially available health food product of cold-pressed hemp seed oil ingested by one volunteer twice a day for 4 1/2 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- …