Mich. Comp. Laws § 600.2143: Subscribing witness to instrument need not be called; exception.

Sec. 2143.

Whenever upon the trial of any action, civil or criminal, or upon the hearing of any judicial proceedings, a written instrument is offered in evidence, to which there is a subscribing witness, it shall not be necessary to call such subscribing witness, but such instrument may be proved in the same manner as it might be proved if there were no subscribing witness thereto, except in cases of written instruments to the validity of which 1 or more subscribing witnesses are required by law.