Mo. Rev. Stat. § 304.152: Roadside checkpoints and roadblock patterns based on vehicle type prohibited.

1. Notwithstanding any provision of the law to the contrary, no law enforcement agency may establish a roadside checkpoint or roadblock pattern based upon a particular vehicle type, including the establishment of motorcycle-only checkpoints.

2. Notwithstanding subsection 1 of this section, a law enforcement agency may establish a roadside checkpoint pattern that only stops and checks commercial motor vehicles, as defined in section 301.010.

3. The provisions of this section shall not be construed to restrict any other type of checkpoint or roadblock which is lawful and is established and operated in accordance with the provisions of the United States Constitution and the Constitution of Missouri.