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Some of precription and non prescritpion pills can give false positive test for Meth like dextromethorphan, diphenhydramine, doxylamine, ibuprofen, naproxen, promethazine, quetiapine, quinolones (ofloxacin and gatifloxacin), and even ranitidine .
So he should be investigated for use of any other pills for issue that could be the possible reason for false positive test test other than Meth itself .
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When lab is in doubt than they do specific method to detect Meth , if it comes positive than surely this could be METH.
So most likely this is Meth .
Nothing is 100 percent , so possibility of false positive still there ...