Michigan Compiled Laws, Chapter 45. Counties § 45.515a

Sec. 15a. (1) Consistent with Act No. 58 of the Public Acts of 1945, being section 46.201 of the Michigan Compiled Laws, and whether or not authorized by the county charter, the county board of commissioners of a county established under this act may adopt an ordinance that designates a violation of the ordinance as a civil infraction and provides a civil fine for that violation.

(2) Whether or not authorized by the county charter, the county board of commissioners may adopt an ordinance that designates a violation of the ordinance as a municipal civil infraction and provides a civil fine for that violation. An ordinance may not designate a violation as a municipal civil infraction if that violation may be designated as a civil infraction under subsection (1). A statute may provide that a violation of a specific type of ordinance is a municipal civil infraction whether or not the ordinance designates the violation as a municipal civil infraction.

(3) An ordinance shall not make an act or omission a municipal civil infraction if that act or omission constitutes a crime under any of the following: