§ 20-5-303 — Jurisdiction to modify determination

(a) Except as provided in W.S. 20-5-304, a court of this
state may not modify a child custody determination made by a
court of another state unless the court of this state has
jurisdiction to make an initial determination under W.S.
20-5-301(a)(i) or (ii) and:
(i) The court of the other state determines it no
longer has exclusive, continuing jurisdiction under a provision
of law from that state that is in substantial conformity with
W.S. 20-5-302 or that a court of this state would be a more
convenient forum under a provision of law from that state that
is in substantial conformity with W.S. 20-5-307; or
(ii) 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.