Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.105

Sec. 105. When the department or other agency is directed to promulgate rules by this act and rules exist on the date the requirement to promulgate rules takes effect, which rules the department or agency believes adequately cover the matter, the department or agency may determine that new rules are not required or may delay the promulgation of new rules until the department or agency considers it advisable.