Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.8811

Sec. 8811. If a law enforcement officer issues a citation under section 8807,  1 the court may accept an admission with explanation or an admission or denial of responsibility upon the citation without the necessity of a sworn complaint. If the defendant denies responsibility for the state civil infraction, further proceedings shall not be had until a sworn complaint relating to the state civil infraction is filed with the court.