Mo. Rev. Stat. § 326.307

The display or uttering by a person of a card, sign, advertisement or other printed, engraved or written instrument or device, printed or through electronic media, bearing a person's name in conjunction with the words "certified public accountant" or any abbreviation thereof, or "public accountant" or any abbreviation thereof, shall be prima facie evidence in any action brought pursuant to section 326.298 that the person whose name is so displayed caused or procured the display or uttering of such card, sign, advertisement or other printed, engraved or written instrument or device and that such person is holding himself or herself out to be a certified public accountant or a public accountant holding a license. In any such action evidence of the commission of a single act prohibited by this chapter shall be sufficient to justify an injunction or a conviction without evidence of a general course of conduct.