Mich. Comp. Laws § 330.1532
In addition to the right to a hearing under section 531, a resident admitted by court order has the right to a hearing and may petition the court for discharge without leave of court once within each 12-month period from the date of the original order of admission. The petition shall be accompanied by a physician's or a licensed psychologist's report setting forth the reasons for the physician's or licensed psychologist's conclusion that the resident no longer meets the criteria for judicial treatment. If no report accompanies the petition because the resident is indigent or is unable for reasons satisfactory to the court to procure a report, the court shall appoint a physician or a licensed psychologist to examine the resident, and the physician or licensed psychologist shall furnish a report to the court. If the report concludes that the resident continues to meet the criteria for treatment, the court shall so notify the resident and shall dismiss the petition for discharge. If the report concludes otherwise, a hearing shall be held according to sections 517 to 522.
MCL 330.1532