Mo. Rev. Stat. § 252.080
Every authorized agent of the commission shall have the same power to serve criminal process as sheriffs and marshals, only in such cases as are violations of this law and rules and regulations of the commission, and have the same right as sheriffs and marshals to require aid in the execution of such process. Any such agent may arrest, without warrant, any person caught by him or in his view violating or who he has good reason to believe is violating, or has violated this law or any such rules and regulations, and take such person forthwith before a associate circuit judge or any court having jurisdiction, who shall proceed without delay to hear, try and determine the matter as in other criminal cases.
§ 252.080, RSMo
RSMo 1939 § 8870, A.L. 1945 p. 664 § 6