Would lidocaine show contained by your drug experiment as cocaine?
Answer:
There is no evidence that xylocaine or lidocaine (in things like ora-gel, or dental anesthesia) will produce a false positive cocaine toxicology oral exam. The cocaine test across the world tests for cocaine metabolites (benzoylcogenine), and this is not thought to cross counter to the "other caines" (eg. xylocaine/lidocaine etc.).
A little lidocaine 6 days earlier shouldn't hold shown up. I'd look elsewhere for the problem.
don't use cocaine. there is no road to get a false positive from lidocaine, benzocaine, or any other drug contained by that familiy for that matter.
it depends upon the question paper kit used. some of the hasty test kit have issues next to false positives. to find out you have to read the box inserts included in the paraphernalia. it is located under limitations.
i hold seen Benedryl which is without blemish legal display a positive result for barb. and a antidepressant display a positive for cocaine.