Ingestion Of Legal Hemp Oils Not Likely To Trigger Positive Drug Test, Study Says

Baltimore, MD: Daily ingestion of legal hemp oil products will not likely trigger a positive drug test result for marijuana, according to findings published in the July 1, 2003 issue of Clinical Chemistry.

“At the federally mandated cannabinoid cutoffs, it is possible but unlikely for a urine specimen to test positive after ingestion of manufacturer-recommended doses of low-THC hemp oils,” authors concluded.

Researchers reported that daily ingestion of hemp oil at low doses produced measurable metabolite concentrations ranging from 5.4 to 38.2 micrograms/L – well below the federal threshold of 50 micrograms/L. In contrast, authors noted that ingestion of the prescription drug Marinol (synthetic THC) produced metabolite concentrations as high as 436 micrograms/L.

Authors wrote that the growing use of hemp foodstuffs and cannabis-based therapeutics could call into question the accuracy and reliability of certain drug testing policies.

Previous studies conducted in the mid-1990s examining the impact of hemp oil ingestion on urinalysis found that regular use of the products could trigger a positive drug test result. However, those studies were performed before hemp food manufacturers imposed industry-wide standards (so-called “Test Pledge” standards) reducing the trace amounts of THC detectable in their products.

Most recently, a 2001 study published in the Journal of Analytical Toxicology reported that the daily ingestion of hemp oil would not produce measurable metabolite levels above 15 micrograms/L.

For more information, please contact Allen St. Pierre, Executive Director of the NORML Foundation, at (202) 483-8751. Abstracts of the study, entitled “Urinary Cannabinoid Detection Times after Controlled Oral Administration of Delta-9-Tetrahydrocannabinol to Humans,” are available online at: