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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes False Positive Test Results For Cocaine?

my question is reguarding the life span of crack cocaine on dentures. my spouse has a gum disease and it causes buildup that s very hard to clean generally and he also periodically uses crack. he tests almost daily. but after I soaked repeatedly and scraped at them one evening the next day he tests positive. knowing 100% the previous day he didn t use how did the tests show positive. it was a very small number
Wed, 14 Dec 2016
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Addiction Medicine Specialist,  's  Response
A lot of causes of false positive many of which we don't know.
BUT the test stays positive for at least 3 days after use and up to a week even with a small use. Note that the difference between a small use and a fatal one is maybe 20x. The difference between the peak amount and the minimal amount the test can detect is > 100x and there's variations in urine concentration, size of the person, etc. So, there isn't a compelling reason to even consider if there are 'false' positives when the person is using cocaine.
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What Causes False Positive Test Results For Cocaine?

A lot of causes of false positive many of which we don t know. BUT the test stays positive for at least 3 days after use and up to a week even with a small use. Note that the difference between a small use and a fatal one is maybe 20x. The difference between the peak amount and the minimal amount the test can detect is 100x and there s variations in urine concentration, size of the person, etc. So, there isn t a compelling reason to even consider if there are false positives when the person is using cocaine.