Michigan Compiled Laws, Chapter 801. Jails and Workhouses § 801.251

Sec. 1. (1) Except as otherwise provided in subsection (3) and subject to section 1a,  1 a sentence or commitment of a person to a county jail for any reason may grant to the person the privilege of leaving the jail during necessary and reasonable hours for any of the following purposes:

(2) A person may petition the court for a privilege described in subsection (1) at the time of sentence or commitment, and in the discretion of the court may renew his or her petition. The court may withdraw the privilege at any time by order entered with or without notice.

(3) A person shall not be granted the privileges described in subsection (1), except for the privilege of leaving the jail during necessary and reasonable hours for the purpose of medical treatment, substance abuse treatment, mental health counseling, or psychological counseling, if the person is housed in the jail while serving all or any part of a sentence of imprisonment for any of the following crimes:

(4) As used in this act, “jail” means a facility that is operated by a county for the detention of persons charged with, or convicted of, criminal offenses or ordinance violations, or persons found guilty of civil or criminal contempt, for not more than 1 year.