Code of Federal Regulations Title 25. Indians § 25.89.31 Negotiation of contract

That person or governing entity recognized as having authority to act for and in behalf of any one of the Five Civilized Tribes in matters of importance may, when it is found there is a substantial need and demand therefor, negotiate and contract for services of a tribal counsel or counsels and technical specialist or specialists, subject to the approval of the Secretary of the Interior or his authorized representative.