Mo. Rev. Stat. § 211.033
No person under the age of seventeen years, except those transferred to the court of general jurisdiction under the provisions of section 211.071 shall be detained in a jail or other adult detention facility as that term is defined in section 211.151. A traffic court judge may request the juvenile court to order the commitment of a person under the age of seventeen to a juvenile detention facility.
(L. 1989 S.B. 163 § 1)