Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.1334

Sec. 1334. (1) The chief judge may excuse any juror or jurors from attendance without pay for any portion of the term. The chief judge shall excuse jurors from attendance on days when it is not expected that they will be required. The chief judge may postpone the service of a juror to a later term of court if the juror has not been called for voir dire examination in any action.

(2) The judge presiding at the trial of an action may excuse jurors from attendance at that trial for cause.