C.R.S. § 14-13-203

14-13-203. Jurisdiction to modify determination. (1) Except as otherwise provided in section 14-13-204, a court of this state may not modify a child-custody determination made by a court of another state unless a court of this state has jurisdiction to make an initial determination under section 14-13-201 (1)(a) or 14-13-201 (1)(b) and: (a) The court of the other state determines it no longer has exclusive, continuing jurisdiction under a provision of law adopted by that state that is in substantial conformity with section 14-13-202 or that a court of this state would be a more convenient forum under a provision of law adopted by that state that is in substantial conformity with section 14-13-207; or (b) A court of this state or a court of the other state determines that the child, the child's parents, and any person acting as a parent do not presently reside in the other state. History: Source: L. 2000: Entire article R&RE, p. 1525, § 1, effective July 1.