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Hello from JustAnswer.
The rapid urine drug screen for meth could be a false positive, either because of the Adderall/dextroamphetamine or simply because these tests have a fair amount of false positives. While the Adderall/dextroamphetamine do not contain any methamphetamine, they are chemically similar, so there can be some cross-reactivity and cause a false positive for meth on the urine drug screen. In addition, some people that are not taking any prescription or recreational drugs will still get a false positive result on these urine drug screening tests. The methodology of these tests are such that a certain amount of false positives will occur, regardless of the situation of the person being tested. It is because of this false positive rate that it is recommended that all persons with a positive urine drug screen should have additional testing through the lab, performing a more accurate test or confirmatory test, such as GC/MS. If the GC/MS is negative, then that would indicate that the screening test was a false positive, regardless of the situation of the patient.
In your case, since there was no further testing with a lab, there is no definite conclusion that can be drawn from the positive urine drug screen. You do not say why this test was done, but you should insist that a confirmatory test be done.
If I can provide any additional information, please let me know.