25 U.S. Code § 1300d–1 - Lower Council Sioux
(a) Membership rolls; applications
The Flandreau Santee Sioux Tribe of South Dakota and the Santee Sioux Tribe of Nebraska shall bring current their membership rolls as of October 25, 1972. The Lower Sioux Indian Community at Morton, Minnesota, the Prairie Island Indian Community at Welch, Minnesota, and the Shakopee Mdewakanton Sioux Community of Minnesota shall prepare rolls of their members who are lineal descendants of the Mdewakanton and Wahpakoota Tribes, and who were born on or prior to and are living on October 25, 1972, using available records and rolls at the local agency and area offices, and any other available records and rolls. Applications for enrollment must be filed with each group named in this section and such rolls shall be subject to approval of the Secretary of the Interior. The Secretary’s determination on all applications shall be final.
(b) Roll of lineal descendants; applications
The Secretary of the Interior shall prepare a roll of the lineal descendants of the Mdewakanton and Wahpakoota Tribe who were born on or prior to and are living on October 25, 1972, whose names or the names of a lineal ancestor appears on any available records and rolls acceptable to the Secretary, and who are not members of any of the organized groups listed in subsection (a) of this section. Applications for enrollment must be filed with the Area Director, Bureau of Indian Affairs, Aberdeen, South Dakota. The Secretary’s determination on all applications for enrollment shall be final.