Mo. Code Regs. Ann. tit. 12, § 10-23.185
PURPOSE: This rule supplements the guidelines for review and approval of personalized motor vehicle license plates prior to issuance.
(2) The following terms, as used in this rule, shall be defined as follows:
(3) No motor vehicle license plate will be issued by the Department of Revenue if the language or symbols on the plate are obscene, profane, patently offensive or contemptuous of a racial or ethnic group, or offensive to good taste or decency, or would present an unreasonable danger to the applicant or public. In order to make this determination, the Department of Revenue will look to the way the average person applying contemporary community standards would view the license plate. Factors which the Department of Revenue may consider in this regard include, but are not limited to—