As DXM itself, probably not; nobody bothers to look for it. There has been
some anecdotal evidence that DXM can cause false positives for opiate
tests, but one paper (374) disputes this. There may be more reliable
evidence that DXM can cause false positives for PCP and possibly cocaine.
So keep this in mind before using DXM if you have to take a drug test. If
worse comes to worse, you can always claim you had a bad cold, and ask them
to do a test which will discriminate between opiates and DXM. Good luck!
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