Mo. Rev. Stat. § 302.011
302.011 Lawfully present defined.
302.011. Lawfully present defined. — For the purposes of sections 302.130 , 302.171 , 302.177 , 302.181 , 302.720 , and 302.735 , United States citizens shall be considered "lawfully present" regardless of their physical location at any given time.
(L. 2004 S.B. 1233, et al. § 2)