Mo. Rev. Stat. § 324.002

Each board or commission shall receive complaints concerning its licensees' business or professional practices. Each board or commission shall establish by rule a procedure for the handling of such complaints prior to the filing of formal complaints before the administrative hearing commission. The rule shall provide, at a minimum, for the logging of each complaint received, the recording of the licensee's name, the name of the complaining party, the date of the complaint, and a brief statement of the complaint and its ultimate disposition. The rule shall provide for informing the complaining party of the progress of the investigation, the dismissal of the charges or the filing of a complaint before the administrative hearing commission.