Mo. Rev. Stat. § 579.090: Tampering with a prescription or a drug prescription order — penalty.

1. Any pharmacist licensed under chapter 338 commits the offense of tampering with a prescription or a prescription drug order as defined in section 338.095 if such person knowingly:

(1) Causes the intentional adulteration of the concentration or chemical structure of a prescribed drug or drug therapy without the knowledge and consent of the prescribing practitioner; or

(2) Misrepresents a misbranded, altered, or diluted prescription drug or drug therapy with the purpose of misleading the recipient or the administering person of the prescription drug or drug therapy; or

(3) Sells a misbranded, altered, or diluted prescription drug therapy with the intention of misleading the purchaser.

2. The offense of tampering with a prescription drug order is a class A felony.