Mo. Rev. Stat. § 346.110: Prohibited acts.

No person shall:

(1) Sell through the mails, hearing instruments without prior fitting and testing by a hearing instrument specialist licensed under this chapter or an audiologist licensed under chapter 345;

(2) Sell, barter, or offer to sell or barter a license;

(3) Purchase or procure by barter a license with intent to use it as evidence of the holder's qualification to engage in the practice of fitting hearing instruments;

(4) Alter a license with fraudulent intent;

(5) Use or attempt to use as a valid license a license which has been purchased, fraudulently obtained, counterfeited or materially altered;

(6) Willfully make a false statement in an application for license or application for renewal of a license.