Idaho Code § 32-11-203: Jurisdiction to modify determination.

Except as otherwise provided in section 32-11-204, Idaho Code, 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 32-11-201(a)(1) or (2), Idaho Code, and:

(a) The court of the other state determines it no longer has exclusive, continuing jurisdiction under section 32-11-202, Idaho Code, or that a court of this state would be a more convenient forum under section 32-11-207, Idaho Code; 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.