Mo. Rev. Stat. § 643.161
643.161 State or political subdivisions contracting with persons not having a ...
643.161. State or political subdivisions contracting with persons not having a permit or in contempt of court prohibited. — 1. No officer, agency or department of the state government, or of any political subdivision of this state shall enter into a contract with any person required to apply for a permit under the provisions of sections 643.010 to 643.190 unless such person has applied for or received a permit or has been granted a variance therefor pursuant to sections 643.010 to 643.190 .
2. No contract shall be entered into by any such governmental authority with any person who is in contempt of any court order enforcing the provisions of sections 643.010 to 643.190 .
(L. 1972 H.B. 1184 § 203.160, A.L. 1992 S.B. 544)