Mo. Rev. Stat. § 57.450
All general laws relating and applicable to the sheriffs of the several counties of this state shall apply to the same officer in the City of St. Louis, except that the sheriff of the City of St. Louis shall not enforce the general criminal laws of the state of Missouri unless such enforcement shall be incidental to the duties customarily performed by the sheriff of the City of St. Louis. The sheriff and sworn deputies of the office of sheriff of the City of St. Louis may be eligible for training and licensure by the peace officer standards and training commission under chapter 590, and such office shall be considered a law enforcement agency with the sheriff and sworn deputies considered law enforcement officers. All acts and parts of acts providing for any legal process to be directed to any sheriff of any county shall be so construed as to mean the sheriff of the City of St. Louis as if such officer were specifically named in such act.
§ 57.450, RSMo