Mo. Rev. Stat. § 221.340
It shall be the duty of such board of visitors, by personal visitation or otherwise, to keep themselves fully advised of the conditions and management of all corrective institutions, supported wholly or in part by county or municipal taxation, or which are under county or municipal control, and especially the county jails. They shall examine every department of each institution, and shall ascertain its condition as to effective and economical administration, the cleanliness, discipline and comfort of its inmates and other respects, and at least once in every three months all of said institutions shall be visited by said board or a committee of its members. In case the said board or one of its committees shall find any state of things in any institution, which in their opinion shall be injurious to the county or to the inmates of the institution, or which is contrary to good order and public policy, it shall be their duty to address a memorial to the presiding judge, sheriff, and county commission, or other officials having jurisdiction, in which memorial they shall set forth the facts observed and shall suggest such remedies as in their judgment may be necessary.
§ 221.340, RSMo