1,2 Some people may say they have used procaine or lidocaine as a way to defend cocaine abuse, but the presence of benzoylecgonine is specific for cocaine or coca tea.As previously mentioned, confirmatory testing with GC-MS will identify individual drugs or metabolites in a sample, and almost...
Failure of Amoxicillin to Produce False-Positive Urine Screens for Cocaine Metabolite Amoxicillin has been causally linked in the lay and medical literature to false-positive urine drug screens for cocaine metabolites. An exhaustive search o... GM Reisfield,J Haddad,GR Wilson,... - 《Journal of...
The EMIT-dau for and the EMIT-ST for opiates (both EMITs from Syva-Merck) gave false-positive results when applied to urine samples of a patient suffering from a moderate monointoxication. The error was not detected in routine TLC. Gas chromatography and mass spectrometry unequivocally indicated...