Mich. Comp. Laws § 49.22

Sec. 2. In case such investigation results in the discovery of facts material to a proceeding for the deportation of such alien, even though such facts alone may not be sufficient grounds for deportation, it shall be the duty of such prosecuting attorney to forthwith advise the secretary of labor of the United States and other proper federal officials of such facts and any evidence obtainable supporting their existence.