Mo. Rev. Stat. § 536.083: Hearing officer not to conduct rehearing or appeal involving same issues and parties.

Notwithstanding any other provision of law to the contrary, in any administrative hearing conducted under the procedures established in this chapter, and in any other administrative hearing conducted under authority granted any state agency, no person who acted as a hearing officer or who otherwise conducted the first administrative hearing involving any single issue shall conduct any subsequent administrative rehearing or appeal involving the same issue and same parties.