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A member asked:
I have been on methadone and oxycodone for several years for knee and back injury. i just tested pos. for fentanyl. how can that be?
A doctor has provided 1 answer
Nonspecific tests: Most drug tests do not differentiate between the opioids. The drugs that you are on could give a false-positive reading for a different narcotic, depending on the test.
Answered 4/24/2015
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