Study: You Can Test Positive for Cannabis on a Hair Test Despite Having Never Used it

hairtestA new study published in the journal Scientific Reports, and published online by the U.S. National Institute of Health, has found that hair drug tests for cannabis are entirely inaccurate, as it’s possible for someone to test positive for the substance despite having never consumed it.

The study has huge implications, given that; “Hair analysis for cannabinoids is extensively applied in workplace drug testing and in child protection cases”.

When testing for ∆9-tetrahydrocannabinol (THC), 11-nor-9-carboxy-THC (THC-COOH), or ∆9-tetrahydrocannabinolic acid A (THCA-A), researchers found that “all three cannabinoids can be present in hair of non-consuming individuals because of transfer through cannabis consumers, via their hands, their sebum/sweat, or cannabis smoke.”

Read moreStudy: You Can Test Positive for Cannabis on a Hair Test Despite Having Never Used it