Michigan Compiled Laws, Chapter 691. Judiciary § 691.1557

Sec. 7.(1) The work product and case files of a mediator or center and communications relating to the subject matter of the dispute made during the dispute resolution process by a party, mediator, or other person are confidential and not subject to disclosure in a judicial or administrative proceeding except for either of the following:

(2) Subsection (1) does not apply to statements, memoranda, materials, and other tangible evidence, otherwise subject to discovery, that were not prepared specifically for use in the dispute resolution process.