Mo. Rev. Stat. § 559.615: Nepotism or financial interest by judges or certain other elected county officials, in private entities, prohibited.

No judge, nor any person related within the third degree of consanguinity or affinity to a judge or any other county elected official with direct court supervision responsibilities, may have a material financial interest in any private entity which contracts to provide probation supervision or rehabilitation services pursuant to sections 559.600 to 559.615.