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For the pain management panel only, regardless of the screen results, GC/MS confirmation for the following drugs are completed and reported individually as positive/negative with a detection limit of 100 ng/mL: morphine, codeine, oxycodone, oxymorphone, hydrocodone, hydromorphone.
National laboratories state that the EMIT test is wrong 25% to 30% of the time, and can result in false during a urine drug test positives from legal substances up to 38% of the time! Antibiotics: Certain antibiotics such as Penicillin and Tetracycline can cause false positive results for opaites or cocaine.