Ingesting legal hemp
seed oil may cause an individual to test positive for THC
metabolites on a standard urine drug screen, according to
three separate reports published in The Journal of Analytical
Results of a study conducted
by ARUP Laboratories in Salt lake City last August indicate
that consumption of cold-pressed hemp seed oil consistent
with the manufacturer's recommendation is "sufficient
to cause a positive finding for cannabinoid metabolites in
a workplace urine drug testing procedure designed to detect
marijuana use." The study noted that test subjects reported
no pharmacological effects after consuming hemp seed oil.
ARUP Laboratories measured
THC concentrations in one healthy adult male volunteer with
no history of drug use. The subject ingested 15 mL doses of
hemp seed oil twice a day for four days. The recommended daily
dose by the distributor was 15-60 mL per day.
Although the test subject
ceased ingesting hemp seed oil after day four of the study,
urine specimens continued to test positive for marijuana for
an additional 48 hours. Minute amounts of THC metabolites
remained detectable for a total of 83 hours after last use.
The study concluded that "Commercially available cold-pressed
hemp seed oil contains cannabinoids at levels capable of producing
a positive standard workplace drug test."
A letter to the editor
published in the same issue affirmed the ARUP findings with
those of a team of international researchers from Finland
and America. "We would like to report on the possibility
of achieving a positive urinalysis for THC metabolites after
modest consumption of commercially available hemp seed oil
in Cannabis-naive individuals," the researchers stated.
They discovered that the daily consumption of 10 mL of hemp
seed oil tested positive for marijuana days after ingestion
had ceased. In a second trial, researchers concluded regular
consumption of hemp seed capsules also tested positive for
marijuana, but at significantly lower levels than of those
who consumed cold-pressed oil. The study concluded, "In
absence of recreational drug use, it may become necessary
to consider this source as a viable explanation for cannabinoid
metabolites in urine." (*NOTE* Recently, two court martial
juries have agreed, overturning marijuana charges after weighing
evidence that the defendant's consumed hemp oil.)
A follow-up study conducted
at the University of Bern in Switzerland found that test subjects
who ingested large amounts of hemp seed oil tested positive
for marijuana for up to six days after last use.
Hemp seed oil is sold
commercially in health food stores across the nation. Presently,
health professionals like Dr. Andrew Weil tout the nutritional
benefits of hemp seed oil, noting that it is second only to
soy in protein and contains the highest concentration of essential
amino and fatty acids found in any food. Hemp seed oil may
be applied to foods just prior to consumption or ingested
in capsule form.
NORML Executive Director
R. Keith Stroup, Esq. said that the results of these studies
further undermine the accuracy and reliability of workplace
urinalysis. "Urine testing for marijuana metabolites
is not a reliable indicator of workplace impairment, and --
in the case of hemp seed oil consumption -- is not an accurate
detector of past marijuana use. As the use of hemp seed oil
gains popularity, employers need to recognize that this legal
product may test positive for marijuana."
Stroup added that NORML
lobbies against suspicionless drug testing in the workplace.
Taken from www.norml.org/facts/hempoil.shtml