Mich. Comp. Laws § 775.13

Sec. 13. (1) If a person attends court as a witness in behalf of the prosecution, upon the request of the prosecuting attorney, upon a subpoena, or because of a recognizance for that purpose, the witness shall be entitled to the following fees: (a) For attending in a court of record, $12.00 for each day and $6.00 for each half day. (b) For attending in a municipal court or upon an examination, $10.00 for each day and $5.00 for each half day. (c) For traveling, 10 cents per mile in going to and returning from the place of attendance, estimated from the residence of the witness if within the state and if without the state, from the boundary line of this state which the witness passed in traveling to attend court. (2) A law enforcement officer shall not receive a fee as a witness in behalf of the people of this state if the law enforcement officer is on duty at the time he or she attends court nor shall the officer receive compensation in going to the place of attendance unless traveling to the court at the officer's own expense.