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Would external contaminants, such as bleaches or cannabis smoke, affect the hair test results?

April 26, 2017affect bleaches cannabis contaminants external hair results smoke Test

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Would external contaminants, such as bleaches or cannabis smoke, affect the hair test results?

1 Answer

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Bleaches, shampoos and external contaminants (i.e. marijuana smoke) have no known impact on test results. Drug residues remain permanently entrapped in the hair.