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Marijuana Detection Time Shorter Than
Previously Assumed in
Drug Testing
The length of time cannabis metabolites may be detected, on average, on a
standard urine screen is typically no longer than ten days for chronic users and
between 3-4 days for infrequent users, according to a literature review
published in the current issue of the Journal Drug Court Review.
Columbia, MO: Feb 23rd 2006
The full text of this finding can be found on this PDF.
http://www.ndci.org/NDCIR VI.pdf
"Everything you need to know about drug testing! "
"Recent scientific literature indicates that it is uncommon for
occasional marijuana smokers to test positive for cannabinoid [metabolites] in
urine for longer than seven days" at 20 ng/ml or above on the EMIT (Enzyme
Multiplied Immunoassay Technique) test, the author concludes. "Following
smoking cessation, chronic smokers would not be expected to remain positive for
longer than 21 days, even when using the 20 ng/ml cannabinoid
cutoff."
When tested at the 50 ng/ml cutoff threshold, infrequent users typically
test negative for the presence of marijuana metabolites within 3-4 days, while
heavy users typically test negative by ten days after ceasing use, the study
found. While several clinical trials from the 1980's found cannabis metabolites
to be identifiable in the urine at low concentrations for longer periods of
time, particularly in heavy users, the author suggests that more advanced
drug-testing technology has narrowed this window of detection. "
As cannabinoid screening tests evolved, these improved assays became more
selective in the manner in which they detected marijuana metabolites," the
author writes. "As detection specificity increased, the length of time
cannabinoids were being detected in urine decreased. ... Therefore, the results
of cannabinoid elimination investigations performed in the 1980's may no longer
be applicable to estimating the detection window for marijuana in urine using
todayıs testing methodologies."
After reviewing data from more recent clinical investigations of chronic
marijuana smokers, the author reports that the "average detection window
for cannabinoids in urine at the lowest cutoff concentration of 20 ng/ml was
just 14 days." However, the author also notes that a minority of subjects
continue to test positive for cannabis metabolites after 28 days, even when
tested by more advanced drug-testing technology.
Approximately 55 million drug screens are performed annually in the United
States. The majority of these are workplace urinalysis tests, which detect the
presence of drug metabolites (inert byproducts produced after a substance is
metabolized by the body), but not the substance itself. Consequently, the US
Department of Justice affirms that a positive drug test result for the presence
of a drug metabolite "does not indicate ... recency, frequency, or amount
of use; or impairment."
For more information, please contact Paul Armentano, NORML Senior Policy
Analyst, at (202) 483-5500. Full text of the study, "The marijuana
detection window: Determining the length of time cannabinoids will remain
detectable in urine following smoking," is available online at: http://www.ncdi.org/ndcirpub.html
The full text of this finding can be found on this PDF.
http://www.ndci.org/NDCIR VI.pdf
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