Compiled Laws, Chapter 168. Michigan Election Law § 168.579

Sec. 579. If an elector, after marking his or her ballot, exposes it to any person in a manner likely to reveal the name of any candidate for whom the elector voted, the board of election inspectors shall reject the ballot and the elector shall forfeit the right to vote at the primary. A note of the occurrence shall be made upon the poll list opposite the name of the elector.This section does not apply to an elector who exposes his or her ballot to a minor child accompanying that elector in the booth or voting compartment under section 736a. 1