Michigan Compiled Laws, Chapter 338. Professions and Occupations § 338.1080

Sec. 30.A private security police officer, as described in section 29,  1 who is properly licensed under this act has the authority to arrest a person without a warrant as set forth for public peace officers in section 15 of chapter IV of the code of criminal procedure, 1927 PA 175, MCL 764.15, when that private security police officer is on the employer's premises. Such authority is limited to his or her hours of employment as a private security police officer and does not extend beyond the boundaries of the property of the employer and while the private security police officer is in the full uniform of the employer.