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DRUG TESTING - URINE & Cannabis studies completed

Overview

How long do urine drug tests detect marijuana? There is no simple answer to this question. Detection time depends strongly on the kind and sensitivity of the test employed; the frequency, dosage, and last time of use; the individual subject's genetic makeup, the state of one's metabolism, digestive and excretory systems; and other random, unknown factors.

also see Drug Testing: Blood, Hair, Oral, Other.

Cannabis - Single Use 1-7+ days
Cannabis - Regular Use 7- 48 days

Science & Research

Undated - Study - Delta(9)-Tetrahydrocannabivarin testing may not have the sensitivity to detect marijuana use among individuals ingesting dronabinol

2012 - Study ~ Unexpected interference of baby wash products with a cannabinoid (THC) immunoassay.

2012 - News ~ Strange Reason for Baby's Positive Pot Test Found

2012 - News ~ Baby Soaps and Shampoos Trigger Positive Marijuana Tests

2012 - News ~ Broncos Linebacker Failed Two Drug Tests By Providing 'Non-Human Urine'

2011 - Study ~ The current status of community drug testing via the analysis of drugs and drug metabolites in sewage

2011 - Study ~ A method for CP 47, 497 a synthetic non-traditional cannabinoid in human urine using liquid chromatography tandem mass spectrometry

2011 - Study ~ Liquid chromatography-tandem mass spectrometry analysis of urine specimens for K2 (JWH-018) metabolites.

2011 - Study ~ Zinc Reduces the Detection of Cocaine, Methamphetamine, and THC by ELISA Urine Testing. 8 to 11 mg of zinc daily; over 40 mg/day can cause zinc poisoning.

2011 - Study ~ Concentrations of delta9-tetrahydrocannabinol and 11-nor-9-carboxytetrahydrocannabinol in blood and urine after passive exposure to Cannabis smoke in a coffee shop.

2011 - Study ~ Quantitative measurement of JWH-018 and JWH-073 metabolites excreted in human urine.

2011 - Study ~ Differentiating new cannabis use from residual urinary cannabinoid excretion in chronic, daily cannabis users.

2011 - Study ~ Efavirenz interference in urine screening immunoassays for tetrahydrocannabinol.

2011 - News ~ NMS Labs & Cerilliant Announce Identification Of Major Metabolite Of The Synthetic Cannabinoid JWH-073

2011 - News ~ What Causes False Positives in Marijuana Drug Testing?

2010 - Study ~ Urine Drug Screening: A Valuable Office Procedure

2010 - Study ~ Delta9-tetrahydrocannabivarin testing may not have the sensitivity to detect marijuana use among individuals ingesting dronabinol.

2010 - Study ~ Testing for cannabis in the work-place: a review of the evidence.

2010 - Study ~ Quantitation of Total 11-Nor-9-Carboxy-Delta 9-Tetrahydrocannabinol in Urine and Blood Using Gas Chromatography-Mass Spectrometry (GC-MS).

2010 - Study ~ Differentiating new cannabis use from residual urinary cannabinoid excretion in chronic, daily cannabis users.

2010 - Study ~ Detection of cannabigerol and its presumptive metabolite in human urine after Cannabis consumption.

2010 - Study ~ Screening for the synthetic cannabinoid JWH-018 and its major metabolites in human doping controls.

2010 - News ~ Now, There's a Test for That -- Norchem's "Fake Marijuana" Test Reveals Significantly Increased Abuse of Spice/K2
2009 - Study - Identifying New Cannabis Use with Urine Creatinine-Normalized THCCOOH Concentrations and Time Intervals Between Specimen Collections

2009 - Study - Extended urinary Delta9-tetrahydrocannabinol excretion in chronic cannabis users precludes use as a biomarker of new drug exposure

2009 - Study - Do Delta(9)-tetrahydrocannabinol concentrations indicate recent use in chronic cannabis users?

2009 - Study - Urinary toxicological screening: Analytical interference between niflumic acid and cannabis

2009 - Study ~ Evaluation of a Human On-site Urine Multidrug Test for Emergency Use With Dogs

2009 - Study ~ Passive inhalation of cannabis smoke--is it detectable?

2009 - Letter ~ Short communication: Urinary excretion of 11-nor-9-carboxy-Delta(9)-tetrahydrocannabinol in a pregnant woman following heavy, chronic cannabis use.

2008 - Study ~ Urine Drug Screening: Practical Guide for Clinicians

2008 - Study - Urinary elimination of 11-nor-9-carboxy-delta9-tetrahydrocannnabinol in cannabis users during continuously monitored abstinence

2007 - Study ~ Urine drug test interpretation: what do physicians know?

2007 - Study ~ Family physicians' proficiency in urine drug test interpretation.

2007 - Study - The effects of adulterants and selected ingested compounds on drugs-of-abuse testing in urine

2007 - Study - Toxicity From the Use of Niacin to Beat Urine Drug Screening

2007 - Study - Simultaneous GC–EI-MS Determination of Δ9-Tetrahydrocannabinol, 11-Hydroxy-Δ9-Tetrahydrocannabinol, and 11-nor-9-Carboxy-Δ9-Tetrahydrocannabinol in Human Urine Following Tandem Enzyme-Alkaline Hydrolysis

2006 - Study - Detection time of regular THC use in urine shorter than often assumed

2005 - Study ~ Papain: a novel urine adulterant.

2004 - Study ~ Passive Inhalation of Cannabis Smoke.

2004 - Study ~ Urinary excretion profiles of 11-nor-9-carboxy-delta9-tetrahydrocannabinol and 11-hydroxy-delta9-THC: cannabinoid metabolites to creatinine ratio study IV.
2003 - Study ~ Urinary Cannabinoid Detection Times after Controlled Oral Administration of {Delta}9-Tetrahydrocannabinol to Humans

2003 - Study ~ Urinary excretion profiles of 11-nor-9-carboxy-Delta9-tetrahydrocannabinol: a Delta9-THC-COOH to creatinine ratio study #2.

2003 - Study ~ Urinary excretion profiles of 11-nor-9-carboxy-Delta9-tetrahydrocannabinol. Study III. A Delta9-THC-COOH to creatinine ratio study.

2002 - Study ~ Effects of Stealth adulterant on immunoassay testing for drugs of abuse.

2002 - Study ~ A procedure for the detection of Stealth adulterant in urine samples.

2002 - Study ~ Effects of oxidizing adulterants on detection of 11-nor-delta9-THC-9-carboxylic acid in urine.

2002 - Study ~ Monitoring urinary excretion of cannabinoids by fluorescence-polarization immunoassay: a cannabinoid-to-creatinine ratio study.

2001 - Study - Delta9-tetrahydrocannabivarin as a marker for the ingestion of marijuana versus Marinol: results of a clinical study

2001 - Study ~ Evaluating the impact of hemp food consumption on workplace drug tests.

2001 - Study ~ Delta9-tetrahydrocannabivarin as a marker for the ingestion of marijuana versus Marinol: results of a clinical study

2000- Study ~ Cannabinoid mimics in chocolate utilized as an argument in court

2000 - Study ~ Effects of pyridinium chlorochromate adulterant (urine luck) on testing for drugs of abuse and a method for quantitative detection of chromium (VI) in urine.

1999 - Study - Potassium nitrite reaction with 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid in urine in relation to the drug screening analysis

1999 - Study ~ Urinary excretion profiles of 11-nor-9-carboxy-delta9-tetrahydrocannabinol: a delta9-THCCOOH to creatinine ratio study.

1999 - Study ~ Adulteration of urine by "Urine Luck".

1999 - Study ~ Potassium nitrite reaction with 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid in urine in relation to the drug screening analysis

1999 - Study ~ Concentration of Marijuana Metabolites in the Urine After Ingestion of Hemp Seed Tea.

1997 - Study - Hemp oil causes positive urine tests for THC

1997 - Study ~ Hemp oil ingestion causes positive urine tests for Δ9-tetrahydrocannabinol carboxylic acid

1997 - Study ~ A procedure to overcome interferences caused by the adulterant "Klear" in the GC-MS analysis of 11-nor-delta9-THC-9-COOH

1997 - Study ~ Excretion of Cannabinoids in Urine After Ingestion of Cannabis Seed Oil.

1997 - Study ~ Marijuana-positive urine test results from consumption of hemp seeds in food products.

1994 - Study ~ Increased detection of marijuana use with a 50 micrograms/L urine screening cutoff.

1993 - Study ~ Effect of freezing on the concentration of drugs of abuse in urine.

1993 - Study ~ High urinary cannabinoids from a hashish body packer.

1990 - Study ~ Cross-reactivity of selected compounds in the Abbott TDx cannabinoid assay.

1988 - Study ~ Marijuana-Laced Brownies: Behavioral Effects, Physiologic Effects, and Urinalysis in Humans Following Ingestion

1987 - Study ~ Cannabinoid intake by passive smoking

1986 - Study ~ Contact highs and urinary cannabinoid excretion after passive exposure to
marijuana smoke

1985 - Study ~ Excretion patterns of cannabinoid metabolites after last use in a group of chronic users

1983 - Study ~ Passive inhalation of marihuana smoke and urinary excretion of cannabinoids

1982 - Study ~ Persistence of Urinary Marijuana Levels After Supervised Abstinence.

1981 - Study ~ Laboratory verification of “heavy” and “light” users of cannabis

1978 - Study ~ Homogeneous enzyme immunoassay for cannabinoids in urine.

1975 - Study ~ Detection of cannabis products in urine by radioimmunoassay.

1972 - Study ~ Confirmation of the Presence of 11-Hydroxy-r 9-Tetrahydrocannabinol in the Urine of Marijuana Smokers

1971 - Study ~ Delta-9-tetrahydrocannabinol: Metabolism and Disposition in Long-term Marihuana Smokers.


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