Mich. Comp. Laws § 600.859

Sec. 859. (1) The following testimony before a probate judge shall be recorded: (a) Testimony in contested matters. (b) Testimony in matters pertaining to the admission to a hospital or other facility for mentally ill or developmentally disabled persons. (c) Testimony in matters pertaining to persons having a contagious disease. (d) Testimony in other matters if requested by an interested party. (e) Testimony and other proceedings required by supreme court rule. (2) In matters not governed by subsection (1), testimony before a probate judge, probate register, or deputy probate register may be given orally without a record being made of the testimony. (3) The court shall keep sufficient index of the testimony and the court shall keep the index and the original notes as prescribed by supreme court rules.