Michigan Compiled Laws, Chapter 15. Public Officers and Employees § 15.267

Sec. 7. (1) A 2/3 roll call vote of members elected or appointed and serving is required to call a closed session, except for the closed sessions permitted under section 8(a), (b), (c), (g), (i), and (j). 1 The roll call vote and the purpose or purposes for calling the closed session shall be entered into the minutes of the meeting at which the vote is taken.

(2) A separate set of minutes shall be taken by the clerk or the designated secretary of the public body at the closed session. These minutes shall be retained by the clerk of the public body, are not available to the public, and shall only be disclosed if required by a civil action filed under section 10, 11, or 13.  2 These minutes may be destroyed 1 year and 1 day after approval of the minutes of the regular meeting at which the closed session was approved.