Missouri courts generally cannot change a child custody order that was made by a court in another state. Missouri can only change it if Missouri has the right to make custody decisions in the first place, AND either the other state's court says it no longer has authority or that Missouri is a better place to handle it, OR a court finds that the child, parents, and anyone acting as a parent no longer live in that other state.
452.800. of another court's . — Except as otherwise provided in section 452.755, a court of this state may not a made by a court of another state unless a court of this state has to make an under (1) or (2) of 1 of section 452.740 and:
(1) The court of the other state that it no longer has under section 452.745 or that a court of this state would be a more under section 452.770; or
(2) A court of this state or a court of the other state determines that neither child, nor a parent, nor any person acting as a parent presently resides in the other state.
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Source & history notes
(L. 2009 H.B. 481)
Related Missouri laws
Full faith and credit
RSMo 452.795
Filing of certified copy of custody decree
RSMo 452.805
Effect of child custody determination
RSMo 452.790
Registration of child custody determination
RSMo 452.810
Appearance of parties and child
RSMo 452.785
Forwarding copies of decrees
RSMo 452.815
Legal information, not legal advice. Always confirm with the official source at revisor.mo.gov.