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The tests supposedly can distinguish between metabolites of the synthetic opioids (i.e. heroin, hydromorphone, hydrocodone, oxycodone, oxymorphone, buprenorphine, fentanyl, and methadone) versus metabolites of true naturally occurring opiates (morphine, codeine, thebaine). These immunoassay kits are subject to false positive and false negative results though. When they are used in a medical setting, any positive has to be confirmed by gas chromatograph and mass spectrophotometer (GC/MS).
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