Mo. Rev. Stat. » Chapter 84
Missouri Revised Statutes

Mo. Rev. Stat. § 84.340 (2026)

✓ current as of May 2026
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  *84.340.  Board of police — power to regulate private detectives. — Except as provided under section 590.750, the police commissioner of the said cities shall have power to regulate and license all private watchmen, private detectives and private policemen, serving or acting as such in said cities, and no person shall act as such private watchman, private detective or private policeman in said cities without first having obtained the written license of the president or acting president of said police commissioners of the said cities, under pain of being guilty of a misdemeanor.

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(RSMo 1939 § 7712, A.L. 2014 S.B. 656 merged with S.B. 852)

Prior revisions: 1929 § 7564; 1919 § 8974; 1909 § 9826

Effective 8-28-14 (S.B. 852); 10-10-14 (S.B. 656), see § 21.250.

*S.B. 656 was vetoed July 14, 2014.  The veto was overridden on September 10, 2014.

(1974) Held constitutional as not being an unlawful delegation of legislative power nor as to being discriminatory in that police officers of the city are not required to be licensed or pay fee when acting as a watchman.  ABC Security Service Inc. v. Miller (Mo.), 514 S.W.2d 521.

Notes of Decisions
Cited in 5 cases (1 in the last 5 years), 1953–2024 · leading case: ABC Sec. Serv., Inc. v. Miller, 514 S.W.2d 521 (Mo. 1974).
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ABC Sec. Serv., Inc. v. Miller, 514 S.W.2d 521 (Mo. 1974). · cites it 12× “They seek to have § 84.340, RSMo 1974, V.A.M.S. declared unconstitutional and void, and in the alternative to have certain regulations made pursuant to said statute declared void.”
Frank v. Wabash R.R. Co., 295 S.W.2d 16 (Mo. 1956). · cites it 3× “— The police commissioner of the said cities shall have power to regulate and license all private watchmen, private detectives and private policemen, serving or acting as such in said cities, and no person shall act as such private watchman, private detective or private…”
Barnard v. Wabash R. Co, 208 F.2d 489 (8th Cir. 1953). · cites it 2× “ered by general denial and alleged that plaintiff was committing acts of trespass upon the private property of defendant, threatening danger to the free passage of trains and the safety of passengers thereon, and to plaintiff himself and his companions, and was detained by…”
K-Mart Corp. v. St. Louis Cnty., 672 S.W.2d 127 (Mo. Ct. App. 1984). · cites it 2× “Louis by § 84.340 RSMo (1978) was an unconstitutional delegation of legislative power by the state legislature.”
Sproaps v. SSM Health St. Louis Univ. Hosp., No. 4:23-cv-01243 (E.D. Mo. Jan. 17, 2024). “065 is a regulation adopted under the authority of Missouri Revised Statutes § 84.340, which authorizes the St. Louis Board of Police Commissioners to regulate and license private security officers.”
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