This is Dr. David
if you are around people who do use cocaine, it can turn your hair testing positve
this study shows that
"significant concentrations of cocaine (>1 ng/mg) and moderate quantities of benzoylecgonine (generally <0.5 ng/mg) are still detectable up to 10 weeks after contamination (external contamination of the hair follicle). These results question the reliability of hair testing. In fact, even using the most sophisticated decontamination procedures it is not possible to distinguish a drug-contaminated subject from an active user. Thus, while a negative result excludes both chronic use and "contact" with drugs, a positive result cannot and must not be interpreted as a sure sign of drug addiction, but should be further confirmed by urine analysis."
you should show this article to your doctors
ask for confirmatory urine testing
and confirmatory mass spectroscopy/gas chromatography confirmatory testing
if you don't use cocaine, the confirmatory tests will be negative.
let me know if you have other questions.
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