Are Hair Drug Test results affected by external exposure to drugs, such as being in the presence of but not personally smoking marijuana?
Positive results for drug use are only found in hair samples that contain both the parent drug and the metabolites, or bi-products of the drug. In order for metabolites to be found the drug must pass through the body by means of actual consumption rather than exposure. For the purposes of marijuana drug screening only the presence of the metabolite is analyzed.
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