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Extended urinary Δ9-tetrahydrocannabinol excretion in chronic cannabis users precludes use as a biomarker of new drug exposure

Substance Use DisordersNew Drug ExposureSubstance AbuseUrologySubstance UseHealth SciencesCannabis UseAddictionMedicineChronic Cannabis UsersDrug TestAddiction MedicinePsychoactive Substance UseDrug AssessmentPharmacologyCannabinoid PharmacologyCannabinoidsCannabis