Mo. Rev. Stat. § 60.321

For the purpose of perpetuating the corners of the United States public land survey, every surveyor who reestablishes a lost corner or restores an existent corner shall monument the corner and shall file an instrument showing such reestablishment or restoration with the Missouri department of agriculture, in accordance with the specifications and procedures adopted by the Missouri department of agriculture. Any surveyor who willfully and knowingly fails to perpetuate corners in accordance with this section is guilty of misconduct in the practice of land surveying.