2011 Utah Code
Title 78B Judicial Code
Chapter 13 Utah Uniform Child Custody Jurisdiction and Enforcement
Section 203 Jurisdiction to modify determination.

78B-13-203. Jurisdiction to modify determination.
Except as otherwise provided in Section 78B-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 Subsection 78B-13-201(1)(a) or (b) and:
(1) the court of the other state determines it no longer has exclusive, continuing jurisdiction under Section 78B-13-202 or that a court of this state would be a more convenient forum under Section 78B-13-207; or
(2) a court of this state or a court of the other state determines that neither the child, nor a parent, nor any person acting as a parent presently resides in the other state.