Mo. Rev. Stat. § 545.250
Current with changes from the 2023 Legislative Session
When any person has knowledge of the commission of a crime, he may make his affidavit before any person authorized to administer oaths, setting forth the offense and the person or persons charged therewith, and file the same with the clerk of the court having jurisdiction of the offense, for the use of the prosecuting attorney, or deposit it with the prosecuting attorney, furnishing also the names of the witnesses for the prosecution; and it shall be the duty of the prosecuting attorney to file an information, as soon as practicable, upon said affidavit, as directed in section 545.240.
§ 545.250, RSMo
RSMo 1939 § 3895