25 U.S. Code § 3115 - Cooperative agreement between Department of the Interior and Indian tribes
In any agreement authorized by this section, Indian tribes and their employees may perform cooperative work under the supervision of the Department of the Interior in emergencies or otherwise as mutually agreed to, but shall not be deemed to be Federal employees other than for purposes of section  2671 through 2680 of title 28 and section  8101 through 8193 of title 5.
Nothing in this chapter shall be construed to limit the authority of the Secretary to enter into cooperative agreements otherwise authorized by law.
 So in original. Probably should be “sections”.