2-3 days: Morphine can be detected in urine up to 72 hours after use, although oxycodone and hydromorphone (other opiods) can be detected even longer. Fentanyl is not detected by the usual opiate drug tests and requires a special/separate test. However, I would not rely on the presumption that the testers are NOT looking for everything conceivable.
Answered 3/9/2015
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