Mo. Rev. Stat. § 188.018: Severability clause.

If any one or more provisions, sections, subsections, sentences, clauses, phrases, or words of this chapter or the application thereof to any person, circumstance, or period of gestational age is found to be unenforceable, unconstitutional, or invalid by a court of competent jurisdiction, the same is hereby declared to be severable and the balance of this chapter shall remain effective notwithstanding such unenforceability, unconstitutionality, or invalidity. The general assembly hereby declares that it would have passed each provision, section, subsection, sentence, clause, phrase, or word thereof, irrespective of the fact that any one or more provisions, sections, subsections, sentences, clauses, phrases, or words of this chapter, or the application of this chapter to any person, circumstance, or period of gestational age, would be declared unenforceable, unconstitutional, or invalid.