Patient chronically on 300mcg of Fentanyl and MSIR 15mg q6h found unresponsive and in respiratory distress at home, was given Narcan by EMS and awoke. Also has Fabrys and a-fib and multiple other medical problems. Urine Drug Screen in the ER was negative for opiates. Was the UDS negative from the Narcan? Lab error? What gives?