Mo. Rev. Stat. § 346.025
346.025 Purchasers under eighteen — outside examination required.
346.025. Purchasers under eighteen — outside examination required. — Any licensed hearing instrument specialist, when dealing with a person eighteen years of age or under, shall ensure that the person has been examined by an otolaryngologist or a physician licensed to practice in Missouri, or a licensed audiologist, and has received a written recommendation from such health care professional within ninety days prior to the fitting.
(L. 1973 H.B. 396 & 257 § 5, A.L. 1995 S.B. 69, et al.)