German Study: Marijuana Hair Testing, An Accurate Method for Detecting Consumption?
In 2015, the researchers at the Institute of Forensic Medicine in Freiburg, Germany showed that the presence of cannabinoids in an individual's hair does not prove that the person consumed marijuana. More specifically, their findings, published in Scientific Reports, indicated that tetrahydrocannabinol (THC), the main active chemical ingredient found in cannabis, can be found in hair of non-consuming individuals due to transfer through cannabis consumers via their hands or sweat, or through passive marijuana-smoke exposure.1
While hair testing is widely used in employee drug screening and in child protective cases, their findings contradicted the prevailing view that hair testing is an accurate method for testing cannabis consumption.
In this study, one male study participant ingested 50 mg THCA-A (tetrahydrocannabinolic acid A), the biogenetic precursor of THC, once per day over a 30-day period. Head, chest, pubic, axillary, and leg hair samples were collected before, as well as once weekly for 3...
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