Grants provided under this chapter may, at the discretion of the school board of the tribally controlled school with respect to which such grant is provided, be used to defray operations and maintenance expenditures for the school if any funds for the operation and maintenance of the school are allocated to the school under the provisions of any of the laws described in section 2504(a) of this title.
Funds provided under any grant made under this chapter may not be used in connection with religious worship or sectarian instruction.
For purposes of this subsection, the term “school site” means the physical location and the facilities of an elementary or secondary educational or residential program operated by, or under contract or grant with, the Bureau for which a discreet  student count is identified under the funding formula established under section 1127 of the Education Amendments of 1978 [25 U.S.C. 2007].
Grants provided under this chapter shall not terminate, modify, suspend, or reduce the responsibility of the Federal Government to provide a program.
Whenever a tribal governing body requests retrocession of any program for which assistance is provided under this chapter, such retrocession shall become effective upon a date specified by the Secretary that is not later than 120 days after the date on which the tribal governing body requests the retrocession. A later date may be specified if mutually agreed upon by the Secretary and the tribal governing body. If such a program is retroceded, the Secretary shall provide to any Indian tribe served by such program at least the same quantity and quality of services that would have been provided under such program at the level of funding provided under this chapter prior to the retrocession.
The tribe requesting retrocession shall specify whether the retrocession is to status as a Bureau-operated school or as a school operated under contract under the Indian Self-Determination and Education Assistance Act [25 U.S.C. 5301 et seq.].
Grants provided under this chapter may not be terminated, modified, suspended, or reduced solely for the convenience of the administering agency.