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You do not say what type of test was done, but the most likely scenario in someone that has not used cocaine is that you had a screening drug test done that had a false positive. The screening tests are very convenient, but the tests have a fair amount of false positives, and the reason for many of the false positives are never known. The usual approach to identify whether the screening test is a false positive is to order a confirmatory test, such as gas chromatography/mass spectrometry, or GC/MS. You should insist that a confirmatory test be done on the urine sample. If the confirmatory test is negative, then that is proof that the screening test was a false positive, and no further evaluation is needed.
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There is no test that is 100%, but the confirmatory test is the gold standard and is quite close, and when the tests is inaccurate, it is that it may miss a drug that is present, rather than incorrectly identify a drug that is not present. The only realistic cause of a false positive on a confirmatory test is from laboratory error, such as confusion or mislabeling of specimens in the lab, which in a certified lab is extremely unusual. The proof of the rare lab error would require testing the same specimen in a different lab, which would be impossible after 5 weeks.
The other possible cause of a true positive in someone that has not intentionally taken a drug is that the person was given the drug without their knowledge.
The confirmatory test is a specialized test that apparently could not be done in the original lab that did the screening test, so that the specimen was then sent to the specialized lab. It does not take 5 weeks to do the confirmatory test, nor does it usually take 5 weeks to transport the specimen, so a 5 week delay usually also indicates that there was some backlog at the specialized lab to do the confirmatory test. As long as the specimen was properly stored, there would not be any issues with accuracy of the test itself because of a 5 week delay, although there is a potential for mishandling or mislabeling of the specimen at every handoff of the specimen.