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Hi, Theoretically yes, as drug tests can be mistaken. However, I would assume both would show up. Something to keep in mind is that narcotics are obviously not regulated by the FDA or government and so you never know if illegal drugs are "real." If you've had a drug test in which only one of the two drugs you used showed up, this could be a reason for it.

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Q: Can one drug show up in a drug UA and not another if you did both drugs the night before?
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