Mich. Comp. Laws § 338.1067a

Sec. 17a. If a private security guard, private security police officer, or private college security force officer acting in the course of his or her employment reasonably suspects that any of the following crimes have occurred, he or she shall immediately notify a law enforcement agency of that suspected crime: (a) An assaultive crime, as defined in section 9a of chapter X of the code of criminal procedure, 1927 PA 175, MCL 770.9a. (b) A violation of section 145c or 539j of the Michigan penal code, 1931 PA 328, MCL 750.145c and 750.539j.