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Hi. I am Dr Abid.Welcome to Just Answer and thank you for the question.I'm reviewing your question now and will post back with your reply.
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 ...