Marijuana Detection Time Frame + Cheats

[Anarchist_1986]

During my quest for knowledge. I found these bits of information very useful. So i thought id share it with everyone else searching for answers and wondering if they are gonna pass a drug test. Hopefully this will ease your minds and you wont have to search like i have since its all right here. These are legitament quotes from medical websites from Toxicologists and other Drs.

This first one is a study ran on several people that smoked 1 joint per week for several weeks and were tested on several diffrent ng/mL levels. (15-ng/mL find the slightest ammount of THC Metabolites and 50-ng/mL making it harder to find THC metabolites in your urine which is what most tests are 50-) I put the important parts bold.

J Anal Toxicol. 1995 Oct ;19 (6):443-9 8926739 (P,S,G,E,B) Cited:1
Detection times of marijuana metabolites in urine by immunoassay and GC-MS.
[My paper] M A Huestis, J M Mitchell, E J Cone

Chemistry and Drug Metabolism Section, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD 21224, USA.
Reports of prolonged drug excretion have provided the basis for the common assumption that cannabinoid metabolites may he detected in urine for a week or longer. The accuracy, sensitivity, and specificity of immunoassays for the detection of cannabinoids and metabolites are unique for a specific assay and may change overtime. it is important that individuals who select assays and those who interpret test results be aware of qualitative and quantitative changes that occur. In the present study, detection times of cannabinoids in urine were determined using cannabinoid immunoassays with 20-, 50-, and 100-ng/mL cutoffs and using gas chromatography-mass spectrometry (GC-MS). Six subjects each smoked a single marijuana cigarette each week while residing on the clinical ward of the Addiction Research Center. Each urine specimen was analyzed under blind conditions by immunoassay according to the manufacturer's instructions. The following cannabinoid reagents were evaluated: EMIT d.a.u. 100, EMIT d.a.u. 50, EMIT d.a.u. 20, EMIT II 100, EMIT II 50, Abuscreen OnLine, and Abuscreen RIA, DRI, and ADx. All urine specimens were also analyzed for 11-nor-9-carboxy-delta9-THC by GC-MS using a 15-ng/mL cutoff. Urinary cannabinoid detection times varied substantially across assays, subjects, doses, and cutoff concentrations. Detection times were shorter than previously assumed. Mean detection times increased from a maximum of 0.5 days after the low dose to 1.5 days after the high dose using the 100-ng/mL cutoff. Mean detection times were less than 1 day following the low dose and less than 2 days following high-dose exposure using the 50-ng/mL cutoff(This is the most common used cutoff level by most courts and employers even in "On the spot" urine tests) Mean detection times ranged from 1 to 5 days after the low dose and from 3 to 6 days after the high dose using the 20-ng/mL cutoff immunoassay. GC-MS detection(Usually a test ran when ur urine is sent to a lab to be tested) times were approximately twice as long as mean detection times using an immunoassay with a cutoff of 50 ng/mL. Differences in sensitivity and specificity between the available immunoassay products affected the efficiency of detection of marijuana use. These results indicate that recent reductions in cannabinoid cutoffs by military and federally mandated programs will increase detection times and improve sensitivity, as expected. However, monitoring acute marijuana usage with a commercial cannabinoid immunoassay that has a 50-ng/mL cutoff concentration provides only a narrow window of detection of 1-2 days.

Full Article: Detection times of marijuana metabolites in urine by immunoassay and GC-MS.

This next one i found on WebMD.com and has quotes from several PHD's and it goes on to talk about "Cheating" on a urine test. (EYE DROPS DO WORK says this PHD)

July 28, 2008 -- Vinegar. Lemon juice. Drain-cleaning products. At least one of these items is probably in your kitchen. And any of them can be used to beat a drug test.

For about 20 years, people have been using a long list of very ordinary household items to confuse prospective employers and drug labs hoping to catch them in the act of using or abusing illegal drugs.

"Does it work? Yes, it does," says Amitava Dasgupta, PhD, a professor of pathology and drug testing expert from the University of Texas-Houston Medical Center. "It's a cat and mouse game."


Dasgupta concedes there are some holes in his drug-testing net. He says parents should be on the lookout for over-the-counter eyedrops. A full vial of the easy-to-buy product can successfully mask THC -- marijuana's active ingredient -- if it's added to a urine sample.

This cheating method doesn't work for heavy marijuana users. But for "borderline" tests, some eyedrops can envelop THC molecules, effectively hiding them from chemical detection, adds Dasgupta.

Full Article: Drug-Test Cheats Try New Tricks on Labs

This one talks about how detection times may not be aslong as people believe.

Columbia, MO: 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.

"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.

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.

Full Article: http://norml.org/index.cfm?Group_ID=6821

As i find more stuff ill post it in this thread....