Colorado constitution
Article V
Section 38

No obligation or liability of any person, association, or corporation, held or owned by the state, or any municipal corporation therein, shall ever be exchanged, transferred, remitted, released, or postponed or in any way diminished by the general assembly, nor shall such liability or obligation be extinguished except by payment thereof into the proper treasury. This section shall not prohibit the write­ off or release of uncollectible accounts as provided by general law.