Mo. Rev. Stat. § 324.1104
Prohibited acts.
324.1104. Prohibited acts. — Unless expressly exempted from the provisions of sections 324.1100 to 324.1148 :
(1) It shall be unlawful for any person to engage in the private investigator business or carry out a private fire investigation in this state unless such person is licensed as a private investigator or private fire investigator under sections 324.1100 to 324.1148 ;
(2) It shall be unlawful for any person to engage in business in this state as a private investigator agency or private fire investigator agency unless such person is licensed under sections 324.1100 to 324.1148 .
(L. 2007 H.B. 780 merged with S.B. 308, A.L. 2011 H.B. 464)