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Oral sex would not cause a positive result on a urine drug test. There would not be any significant transfer of drug during the encounter of oral sex.
If the test was a screening test, then it may well be a false positive, as there are many instances of false positive for meth on a drug screening test. If there was a confirmatory test that was also positive for meth, it cannot be blamed on oral sex. However, it is possible that she could have accidentally placed the drug in food that you consumed that would be sufficient to cause a positive test.
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