My best friend got himself caught up in a marijuana possession charge and has been on probation for a little while now. Since he's been on probation, he gave legal proof from a doctor to his probation officer that he had ADHD, and was prescribed Vyvanse 20mg. The other day he got his hands on Vyvanse 30mg from someone else and took quite a lot of them. Less than 24 hours after the last pill he took, he was called in for a random drug test. My question is: since he's prescribed the medication anyway, is there still some way for the tests to show that he took more than he was supposed to? I really don't want him to end up in jail.

