What can do a false positive on a cocaine urine drug testing?

i tested positive for cocaine but have never touched it. I have hip replacement surgery and have be on oxicontin and darvocet. It has to lead to false positive because that's all i own ingested!
Answers:
Probably not...

MAYBE some sort of common energu drinks may of set it bad, but honestly the most likely culprit is cocaine.... sorry



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