Mo. Rev. Stat. § 631.165: Transfer of patient to a mental health facility, when, procedure.

If the head of the alcohol or drug abuse facility finds that a person who is detained for treatment and rehabilitation is presenting a likelihood of serious harm as a result of mental disorder other than alcohol or drug abuse, or both, the head of the facility shall arrange for the transfer of the person to a mental health facility through a licensed physician, registered professional nurse, qualified counselor or mental health professional designated by the mental health facility. The person may be detained for up to ninety-six hours for evaluation and treatment, under the procedures of sections 632.310, 632.315, 632.320 and 632.325, before filing a petition for further detention under sections 632.330 and 632.335.