Mo. Rev. Stat. § 330.200: Evidence of practice.

It shall be deemed prima facie evidence of the practice of podiatric medicine, or of holding oneself out as a practitioner within the meaning of this chapter, for any person to treat in any manner the human foot by medical, mechanical, or surgical methods, or to use the title "podiatrist" or "registered podiatrist", or any other words, or letters, which designate, or tend to designate, to the public that the person so treating or holding himself or herself out to treat, is a podiatrist.