What Can Cause A False Positive For Cocaine

I have been told I failed a police blood test for a metabolite of cocaine? I'm out my mind with worry as im drug free and have been for 8 years apart from over the counter medication and prescribed Meds. prior to the test I had taken a course of amoxicillin and was also using a gel for severe toothache ingredients "tetracaine" although it says don't use orally. I was putting the gel directly onto my broken back teeth as I was in agony, I don't even drink coffee. I use inca tea as a replacement as I suffer from combat stress syndrome, I've taken a list of many over the counter medications from Chinese herbs to Suddafed sprays. Also im under a surgeon who is treating me for a sinus problem! I'm totally at my wits end. please can you tell me if I could have had a false positive result?

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Amoxicillin can be wrongly mistaken as cocaine in a UA

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Can lupin 500 (cephalexin) be mistaken as cocaine? Took one the other day because my tooth was hurting. It is an antibiotic.

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Both those medications have been proven to show false positive for cocaine unfortunately.

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