25 C.F.R. § 161.604

(a) If the Resources Committee notifies BIA that a specific permit violation has occurred, BIA will initiate an appropriate investigation within 5 business days of that notification.

(b) Unless otherwise provided under tribal law, when BIA has reason to believe that a permit violation has occurred, BIA or the authorized tribal representative will provide written notice to the permittee within 5 business days.