Mo. Rev. Stat. § 632.600: Expiration of order — extension, when.

1. The court order for assisted outpatient treatment shall expire at the end of the period specified in the order unless a petition for an extension has been filed. If any person or entity authorized to file a petition under section 632.585 determines that a respondent requires further involuntary assisted outpatient treatment, the person or entity shall file a petition for continued assisted outpatient treatment before the expiration of the involuntary assisted outpatient treatment ordered by the court.

2. The procedure for obtaining an extension shall be the same as for obtaining the original order, except that the thirty-six-month time period provided in paragraph (b) of subdivision (2) of section 632.590 shall not be applicable in determining the appropriateness of an extension.