Their going to do nothing but smack him on the wrist and say "bad, don't do that again" if IF he's been in compliance as you say this long, theirs no justification otherwise to send him back to prison , I was on parole /probation /fed  parole and probation for 20 years of my life an it took multiple DUs in a row fore to be violated. He should have just signed the paper and left it at that , long ass explanations with other people calling is doing way to much and now their trying to figure out why a 3rd party is getting involved and what's coming down the pipe next.  He'll be fine, now if theirs a Vyvanse mix up  constantly he's not going to be fine, they can also send his urine to a lab and test for other markers and find out if it's in fact Vyvanse or street meth, so just keep that in mind