Missouri Revised Statutes Title IX. Suffrage and Elections § 116.070. Petitioner may sign by mark, procedure

When any voter wishes to sign an initiative or referendum petition and is unable to sign his name, the circulator shall print the required information on the petition. The voter shall then make his mark, and the circulator shall attest to it by his signature. For purposes of this chapter, all marks made and attested in accordance with this section shall be considered signatures.