Mo. Rev. Stat. § 452.840
Current with changes from the 2023 Legislative Session
If a custody decree has been rendered in another state concerning a child involved in a custody proceeding pending in a court of this state, the court of this state, upon taking jurisdiction of the case, shall request of the court of the other state a certified copy of the transcript of any court record and other documents mentioned in section 452.835.
§ 452.840, RSMo