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Review Question - QID 213779

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QID 213779 (Type "213779" in App Search)
A forensic scientist receives a substance for evaluation that was found on an unconscious patient. She discovers that the substance binds to and activates opioid receptors in the central and peripheral nervous system. She discovers that this activation occupies all available receptors at maximal response. Kinetically, she discovers that the substance has an onset of action of about 30 minutes and that it decays with a half life of about 24 hours. Which of the following substances was most likely found on this patient?