Mo. Rev. Stat. § 191.725

Beginning January 1, 1992, every licensed physician who provides obstetrical or gynecological care to a pregnant woman shall counsel all patients as to the perinatal effects of smoking cigarettes, the use of alcohol and the use of any controlled substance as defined in section 195.017, schedule I, II, or III for nonmedical purposes. Such physicians shall further have all patients sign a written statement, the form of which will be prepared by the director of the department of health and senior services, certifying that such counseling has been received. All such executed statements shall be maintained as part of that patient's medical file. The director of the department of health and senior services, in cooperation with the department of mental health, division of alcohol and drug abuse, shall further provide educational materials and guidance to such physicians for the purpose of assuring accurate and appropriate patient education.