Mo. Rev. Stat. § 631.140
2. Within ninety-six hours following initial detention, the head of the facility or the mental health coordinator may file, or cause to be filed, a petition for a thirty-day involuntary detention, treatment, or rehabilitation period provided he has reasonable cause to believe that the person abuses alcohol or drugs and presents a likelihood of serious harm to himself or others as a result of alcohol or drug abuse, or both. The court shall serve the petition and list of prospective witnesses for the petitioner upon the respondent and his attorney at least twenty-four hours before the hearing. The head of the facility shall also notify the mental health coordinator if the petition is not filed by the mental health coordinator. The petition shall:
(L. 1985 S.B. 265, A.L. 1996 S.B. 884 & 841)