However from what I have read, it will show up
in the initial screening as a general
amphetamine. After a positive initial screening, the sample will be further tested using a different methodology that will specify the type of amphetamine. Of course, if you have taken your generic version of adderall after the concerta for a couple of days. That should be what shows up.
But, I would think that as long as you have the prescription for the adderall, you should be ok.