As required by sections 25 U.S.C. 5366(d) and 5375, in any administrative action, appeal, or civil action for judicial review of any decision made by the Secretary under this title, the Secretary shall have the burden of proof:

(a) To demonstrate by a preponderance of the evidence the validity of the grounds for a reassumption under 25 U.S.C. 5366(b);

(b) To clearly demonstrate the validity of the grounds for rejecting a final offer made under 25 U.S.C. 5366(c); and

(c) Except as provided in 25 U.S.C. 5366(d), to demonstrate by a preponderance of the evidence the validity of the grounds for a decision made and the consistency of the decision with the requirements and policies of the Act.