Mo. Rev. Stat. § 534.210
The merits of the title shall in nowise be inquired into, on any complaint which shall be exhibited by virtue of the provisions of this chapter.
(RSMo 1939 § 2853)
Prior revisions: 1929 § 2467; 1919 § 3015; 1909 § 7677
(2013) Section does not create irrebuttable presumption that title is proven merely by filing an unlawful detainer action and thus does not violate either due process or equal protection. Wells Fargo Bank, N.A. v. Smith, 392 S.W.3d 446 (Mo.banc).