Mo. Code Regs. Ann. tit. 13, § 40-31.020
State ex rel. Gladfelter v. Lewis, 595 SW2d 788 (Mo. App. 1980). Mandamus will not lie to challenge the validity of 13 CSR 40-31.020, RSMo since an adequate remedy for that purpose is found at section 536.050(1) and (2), RSMo (1978).