Adderall is a mixture of dextro-amphetamine and amphetamine. Crystal meth is methamphetamineYan active ingr. in Desoxyn). Adderall will show up POSITIVE for AMPHETAMINES or A-AMPHETAMINE(aka legal amps). Now, methamphetamine will come up separately because of it being methylized, therefore having a diff. metabolite from Adderall amps. Usually they test for "AMPHETAMINES" &"METHAMPHETAMINES" separately. If by any chance ur Adderall( and u ONLY have taken legally prescribed Adderall) tests Positive for METHamps, RAISE THE HELL AND MAKE THEM confirm it with GC/MS.