Drug-class-specific verification considerations (opioids, amphetamines, cocaine, marijuana/THC, PCP, MDMA), permitted prescriptions, and clinical interpretation of positive results.
A commercial driver's urine specimen is reported by the laboratory as confirmed positive for morphine at a concentration of 18,000 ng/mL. The laboratory report indicates that 6-acetylmorphine (6-AM) was not detected. During the verification interview, the driver denies any drug use but provides a detailed account of consuming multiple poppy seed muffins daily for the past week. The driver has no valid prescriptions and a physical examination reveals no clinical signs of opiate abuse. What is the MRO's required action?