Mich. Comp. Laws § 338.1069

Sec. 19. (1) The particular type of uniform and insignia worn by a licensee or his or her employees must be approved by the department and shall not deceive or confuse the public or be identical with that of a law enforcement officer of the federal government, state, or a political subdivision of the state in the community of the license holder. Shoulder identification patches shall be worn on all uniform jackets, coats, and shirts and shall include the name of the licensee or agency. Shoulder identification patches or emblems shall not be less than 3 inches by 5 inches in size. (2) A badge or shield shall not be worn or carried by a security alarm system agent, private security police officer, private college security force officer, or an employee or licensee of a security alarm system contractor, private security police organization, private college security force, or private security guard agency, unless approved by the director of the department. (3) A person who is not employed as a security guard shall not display a badge or shield or wear a uniform of a security guard. A person who violates this subsection is guilty of a misdemeanor punishable by imprisonment for not more than 93 days or a fine of not more than $500.00, or both. (4) A person licensed as a security alarm system contractor, security alarm system agent, or a private security guard or agency is not authorized to carry a deadly weapon unless he or she is licensed to do so in accordance with the laws of this state. (5) A licensee may authorize his or her employees to carry any commercially available tactical baton.