False Positive For Propxyphene

Updated

I had a pre-employment 10 panel urine test done at LabCorp and resulted through e-Drug Test. I was taking oxycontin, adderall, allegra, seroquel and clonazepam. It resulted positive for amphetamines (from the adderall) and negative for benzodiazepines (although my use of clonazepam was daily and long term).
The problem is it tested POSITIVE for propoxyphene. I simply do not understand it. I even paid to have it sent to a second lab to be retested because I had never taken propoxyphene (darvocet, darvon, etc). It was positive at the second lab as well.
Propoxyphene was taken off the market years ago.
I need to be accountable for this, but how can I prove that I didn't take the medication? The whole thing is ridiculous because why on earth would I take propoxyphene when I had a valid script for oxycontin and the drug test was planned, with the appointment being made by myself??
I'm at a loss and can lose my professional license.

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