Mo. Rev. Stat. § 454.1542

A tribunal of this state exercising personal jurisdiction over a nonresident in a proceeding under sections 454.1500 to 454.1728, under other law of this state relating to a support order, or recognizing a foreign support order may receive evidence from outside this state pursuant to section 454.1593, communicate with a tribunal outside this state pursuant to section 454.1596, and obtain discovery through a tribunal outside this state pursuant to section 454.1599. In all other respects, Article 3 through 6, sections 454.1548 to 454.1677, do not apply, and the tribunal shall apply the procedural and substantive law of this state.