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While individual practices may differ, this is the position of the American College of Medical Toxicology at the time written, after a review of the issue and pertinent literature.
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Connors, N., Kosnett, M.J., Kulig, K. et al. ACMT Position Statement: Interpretation of Urine for Tetrahydrocannabinol Metabolites. J. Med. Toxicol. 16, 240–242 (2020). https://doi.org/10.1007/s13181-019-00753-8
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DOI: https://doi.org/10.1007/s13181-019-00753-8