Mich. Comp. Laws § 432.220

Sec. 20. In addition to other penalties provided for under this act, a person who conducts a gambling operation without first obtaining a license to do so, or a licensee who continues to conduct gambling games after revocation of the licensee's license, or any licensee who conducts or allows to be conducted any unauthorized gambling games in a casino in which the licensee is authorized to conduct its gambling operation is subject to a civil penalty equal to the amount of gross receipts derived from wagering on the gambling games, whether unauthorized or authorized, conducted on that day as well as confiscation and forfeiture of all gambling game equipment used in the conduct of unauthorized gambling games.