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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.”

The study notes that; “This is of concern for e.g. child-custody cases as cannabinoid findings in a child’s hair may be caused by close contact to cannabis consumers rather than by inhalation of side-stream smoke.”

The full study, conducted at the University of Freiburg in Germany, can be found by clicking here.

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About Anthony Martinelli

Anthony, co-founder and Editor-in-Chief of TheJointBlog, has worked closely with numerous elected officials who support cannabis law reform, including as the former Campaign Manager for Washington State Representative Dave Upthegrove. He has also been published by numerous media outlets, including the Seattle Times. He can be reached at TheJointBlog@TheJointBlog.com.

1 comment

  1. Penny Ann Moore- Sanders

    I have the need for this study the fibromyagia and neuropathy and my mental heath issues also spinal issues

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