Mich. Comp. Laws § 764.14: Arrest by private person; disposition of arrested person; complaint.

Sec. 14.

A private person who has made an arrest shall without unnecessary delay deliver the person arrested to a peace officer, who shall without unnecessary delay take that person before a magistrate of the judicial district in which the offense is charged to have been committed. The peace officer or private person shall present to the magistrate a complaint stating the charge against the person arrested.