Colo. Const. art. V, § 25

Special legislation prohibited. The general assembly shall not pass local or special laws in any of the following enumerated cases, that is to say; for granting divorces; laying out, opening, altering or working roads or highways; vacating roads, town plats, streets, alleys and public grounds; locating or changing county seats; regulating county or township affairs; regulating the practice in courts of justice; regulating the jurisdiction and duties of police magistrates; changing the rules of evidence in any trial or inquiry; providing for changes of venue in civil or criminal cases; declaring any person of age; for limitation of civil actions or giving effect to informal or invalid deeds; summoning or impaneling grand or petit juries; providing for the management of common schools; regulating the rate of interest on money; the opening or conducting of any election, or designating the place of voting; the sale or mortgage of real estate belonging to minors or others under disability; the protection of game or fish; chartering or licensing ferries or toll bridges; remitting fines, penalties or forfeitures; creating, increasing or decreasing fees, percentage or allowances of public officers; changing the law of descent; granting to any corporation, association or individual the right to lay down railroad tracks; granting to any corporation, association or individual any special or exclusive privilege, immunity or franchise whatever. In all other cases, where a general law can be made applicable no special law shall be enacted.