Mich. Comp. Laws § 339.559

Sec. 559. Beginning on January 1, 1990, the department may review all pending cases and identify those matters occurring before January 1, 1990 which would have been addressed by a citation, had such a program existed at the time the complaint was filed with the department. The department shall notify each respondent that the person may conclude the department's proceedings by accepting the penalties and proposed compliance actions as set forth in a citation or may continue the proceedings under the provisions of the process initiated in section 508.