Mo. Rev. Stat. § 579.041: Drug masking product, unlawful distribution, delivery, or sale of — penalty.

1. For purposes of this section, the following terms mean:

(1) "Drug masking product" , synthetic urine, human urine, a substance designated to be added to human urine, or a substance designated to be added to or used on human hair or oral fluid for the purpose of defrauding an alcohol or a drug screening test;

(2) "Synthetic urine" , a substance that is designated to simulate the composition, chemical properties, physical appearance, or physical properties of human urine.

2. A person commits the offense of unlawful distribution, delivery, or sale of a drug masking product if the person unlawfully distributes, delivers, or sells a drug masking product.

3. The offense of unlawful distribution, delivery, or sale of a drug masking product is a class A misdemeanor.