Iowa Code
Chapter 12A - UNIFORM FINANCE PROCEDURES FOR STATE-ISSUED BONDS
Section 12A.10 - State law.

12A.10 State law.
The state reserves the right at any time to alter, amend, repeal, or otherwise change the structure, organization, programs, or activities of any issuer, including the power to terminate the issuer, except that a law shall not be enacted that impairs any obligation made pursuant to any contract entered into by the issuer with or on behalf of the holders of the bonds to the extent that any such law would contravene
Article I, section 21, of the Constitution of the State of Iowa
or Article I, section 10, of the Constitution of the United States.
2007 Acts, ch 133, §10; 2008 Acts, ch 1065, §9