Mich. Comp. Laws § 257.214: Badge of authority.

Sec. 214.

The secretary of state shall issue to each person named under section 213 of this act a proper badge of authority designating the position held by the person to whom issued. Every such badge shall display a distinctive serial number.

Neither the secretary of state nor any other person shall issue any such badge to any person who is not a duly employed and acting officer or investigator of said department.