Mo. Rev. Stat. § 572.020
572.020 Gambling — penalty.
572.020. Gambling — penalty. — 1. A person commits the offense of gambling if he or she knowingly engages in gambling.
2. The offense of gambling is a class C misdemeanor unless:
(1) It is committed by a professional player, in which case it is a class A misdemeanor; or
(2) The person knowingly engages in gambling with a child less than seventeen years of age, in which case it is a class B misdemeanor.
(L. 1977 S.B. 60, A.L. 2014 S.B. 491) Effective 1-01-17