False Positive Drug Test

 Pass a Drug Test 


 Although urine tests are far from infallible, it is difficult to challenge positive test results. "False positives," in which workers are wrongfully accused of marijuana use, are highly unlikely so long as labs exercise proper care (however, not all labs do this). The standard procedure is to first screen the samples with an immunoassay test (e.g., EMIT or RIA), then confirm positive results with the more accurate gas chromatograph mass spectrometer (GCMS). This virtually eliminates the chance of false positives in exchange for a relatively high rate of "false negatives," where drug use is not detected. The sensitivity of the test is determined by the concentration of metabolites it is set to detect: for the Dept. of Transportation, the standard cutoff is 50 nanograms/milliliter (ng/ml).

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No substance is known to produce a false positive for marijuana. It used to be that ibuprofen (Advil, Motrin, Nuprin) interfered with the marijuana test, but this problem has been fixed. A variety of over-the-counter medicines can cause false positives for amphetamine and other illicit drugs on the EMIT test, but not on the GCMS.

"Passive smoking" of marijuana is not an acceptable excuse at the 50 ng/ml level, since only in extreme circumstances can a non-smoker absorb enough pot to test urine positive (e.g., being stuck in a closet full of heavy smokers for hours). However, passive exposure may result in positive tests at 25 ng/ml or lower. 


Be prepared the next time somebody wants you to pass a drug test.

False Positives - Drug Testing What is a false positive? It is a test result that is returned when a substance tests positive for another compound. It is a case of mistaken identity. For example if you eat a couple poppy seed cakes before testing, you can get a positive result for opiates. The chances of you getting a false positive depends on the quality of the laboratory that does the testing. There seems to be about 1,200 of these labs in the United States currently testing for drugs. Less than a 100 of these meet federal standards and most of the individual states do not regulate drug test labs. The number of false positives returned range from 4% to over 50%, depending on the lab. A concern here is that, if your company tests for drug useage, they are probably not required to use a certified drug testing lab, which means you have a greater chance of getting a false positive. Listed below are products reported to cause a false positive drug test result.

With your help, this will grow into a comprehensive list. Last updated, December 19, 2010. Substances that cause false positives 4-Way Nasal Spray - false positive for Amphetamines, Morphine Accutrim - false positive for Ecstasy (MDMA), Meth ) Acetaminoph w/codeine - false positive for Morphine Acet-AM - false positive for Amphetamines, Heroin, Opiates Acro-Lase Plus® contains barbiturates A.P.C. w/codeine - false positive for Morphine A.R.M. - false positive for Amphetamines Actifed - false positive for Amphetamines Actifed with Codeine Cough Syrup Adderall® - is an amphetamine, positive for Meth Advil - false positive for THC, Marijuana Afrin - false positive for Ecstasy (MDMA), Meth Aleve - false positive for THC, Marijuana Alka-Seltzer - false positive for Amphetamines Alka-Seltzer Plus - false positive for Amphetamines, Morphine Allerest - false positive for Amphetamines, Ecstasy, Meth and Morphine Alprazolam contains benzodiazepines Amantadine Ambenyl contains codeine Amesec - false positive for Amphetamines, Heroin, Opiates Amfepramone - false positive for Amphetamines, Ecstasy (MDMA), Meth Amifepramone - false positive for Amphetamines and Ecstasy Amineptine - false positive for Amphetamines and Ecstasy Amitriptyline - false positive for LSD Amogel PG® contains opium/morphine Amoxicillin - false positive for cocaine Ampicillin - false positive for cocaine Amphetaminil metabolizes to amphetamine Ampicin - can cause false positive for opiates Anaprox - false positive for THC, Marijuana Ansaid - false positive for marijuana Anti Anxiety medication, most - false positive for benzodiazepines Anti Inflammatories such as Naproxyn Antiasthmatics that contain phenobarbitol - false positive for barbiturates Antibiotics - false positives for Heroin, Cocaine Antrocol Elixor® contains barbiturates Apo-Naproxen - false positive for THC, Marijuana Artane - false positive for LSD Ascriptin w/codeine - false positive for Morphine Aspirin with Codeine Asthma medications - false positives for Amphetamines and Ecstasy We offer all Natural Herbal Cleansing Detox products for Blood, Urine, Saliva, and sweat  Patch. 

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