Adderall is a psycho stimulant. Many people use this as street drug for recreation purpose. This is bad habit as it can cause many health related problems. This drug is tested for drug abuse. In blood it can be tested positive for 12 hour, in urine for 1-3 days and in hair follicles for 90 days.
Adderall is nothing more than a mixture of amphetamines. It will show up as amphetamine/methamphetamine . But If you have a prescription for Adderall, then this "Fail Positive" can be excused and its best to notify them before hand that you have a prescription. Also can be detected for longer period of time ( for amphetamines. With urine test - 1-7 days) if you are wilh slow metabolism, over weight, use from a long time, heavy user, etc.. Detection with hair drug test- 90 days.