Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.1313b

Sec. 13b. (1) A certified specialty or master mechanic shall display, in a conspicuous location in the place of business where he or she is employed or engaged to perform repairs, a current and valid certificate issued by the administrator.

(2) If a certified mechanic works on, inspects and approves, or supervises a repair, he or she shall affix his or her name and certification number, as assigned by the administrator, to the written statement of repairs given the customer under section 34.  1

(3) A certified specialty or master mechanic or mechanic trainee shall not depart from, or disregard in any material respect, accepted motor vehicle repair industry standards. Compliance with published vehicle manufacturer, parts manufacturer, equipment manufacturer, or recognized aftermarket repair manual specifications creates a presumption that the mechanic or mechanic trainee has followed accepted motor vehicle repair industry standards.

(4) If the administrator, after notice and a hearing, determines that a specialty or master mechanic or mechanic trainee has violated subsection (3), the administrator may, under section 21,  2 require that the specialty or master mechanic or mechanic trainee do both of the following: