Why did I test positive for meth when I used Adderall?

Counterfeit Adderall pills often contain methamphetamine.

Adderall and methamphetamine have indistinguishable effects, so the pills would feel like the real thing.

Adderall is a mixture of four different types of amphetamine. Depending on the test, it may look for active chemicals or long lasting metabolites. If it is metabolites then life can become difficult.