The first thing he needs to do is call is PO. His parole conditions require he do this within 48 hours. This is parole condition NUMBER ONE. The PO will find out about it and failure to report makes this TWO violations of his parole not just one. Hopefully, he doesn't have an additional condition on no drinking. Violations could result in anything from a slap on the wrist to a revocation of parole (go back to jail). In addition he's facing the penalties on the new crime.