Mich. Comp. Laws § 436.1815

Sec. 815. (1) In defense of a civil action under section 801, a retail licensee may present evidence that, at the time of the selling, giving, or furnishing of the alcoholic liquor, the retail licensee was adhering to responsible business practices. Responsible business practices are those business policies, procedures, and actions which an ordinarily prudent person would follow in like circumstances. The compensating of an employee of an on-premises retail licensee on a commission basis constitutes an unreasonable business practice for purposes of this section. (2) The compensation of an employee of an on-premises retail licensee shall not be on a commission basis.