S.D. Codified Laws § 1-16A-99
The state pledges to and agrees with the holders of capital outlay certificates issued or any lease purchase agreement as part of a program sponsored by the Health and Educational Facilities Authority or secured by a pledge of state aid to education funds that the state will not limit or alter the pledge of state aid to education funds or the provision of this section governing the pledge or the terms provided in §§ 13-19-27, 13-19-29, and 13-13-39, inclusive, so as to impair the terms of any contract made by the school district, the state, or the authority. The school district, state, or authority may not impair the rights and remedies of the holders until the capital outlay certificates or lease purchase obligation, together with interest on the certificates and obligations and all costs and expenses in connection with any action or proceedings by or on behalf of the holders are fully met or discharged. In addition, the state pledges to and agrees with the holders that the state may not limit or alter the basis on which state aid to education funds pledged under the authority of any provision of §§ 1-16A-76, 1-16A-97 to 1-16A-99, inclusive, 13-19-27, 13-19-29, 13-13-39, and 13-13-74 are to be paid to the authority or any financial institution designated by the authority so as to impair the terms of the contract. The school district and authority may include the pledges and agreements of the state in any contract with the holders of capital outlay certificates issued or any lease purchase obligation secured pursuant to §§ 13-19-27, 13-19-29, and 13-13-39, inclusive, or otherwise secured by a pledge of state aid to education funds.
SDCL 1-16A-99