There are several issues to consider in this situation. Yes, it is possible that these medicines could cause a false positive for cocaine. The amoxicillin has been reported to cause a false positive urine drug screen for cocaine. There also are many false positive results on drug screens for which the cause cannot be identified. The general recommendation is that any positive urine drug screen should be confirmed by a more specific test, such as gas chromatography/mass spectrometry (GC/MS). The GC/MS will be able to differentiate a true positive from a false positive, although it will not identify the cause of the false positive. The only way to prove it at this point is to request that the specimen that had a positive urine drug screen be further tested by GC/MS. Unfortunately, the urine specimen would have had to be saved to be able to be tested. If the urine is discarded, you can request that another test be performed, but the doctor may be hesitant to consider that a repeat test is meaningful, as the person could have simply quit using after the initial test to yield a subsequent negative test. The other option would be to ask the doctor to perform a hair follicle drug test, which will look back for 90 days, so will cover the period during which it is thought that you used cocaine.
I did not have an ENT or any other procedures nor any exposure to cocaine at home or work. I don't think there was error in the collection process nor do I have money for a lawyer. There HAS TO be some explanation for this result. This was a dip stick type test performed in the clinic. Something that does strike me to be odd is that I also take klonopin bid yet the test was neg for benzos. Not to question your expertise but I have found ALOT of information stating amoxicillin can cause false positives on several websites along with lidocaine & large amounts of caffeine (maybe not scientifically proven). Can you provide me with information or studies this information has been scientifically disproven? Also, does my PCP have any obligation or right to report these results to law enforcement or health boards since I am a Licensed nurse?