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N.P., a male in his late fifties, was found unconscious on a commuter train during the morning rush hour. An initial exam by emergency medical technicians (EMTs) revealed pinpoint pupils, slow and shallow breathing, and pale, cold skin. His body was limp, and he was unconscious. The EMTs administered naloxone intravenously on the scene and brought him to the emergency department (ED). By the time he reached the ED, he was awake and his breathing and pupils had returned to normal.