Michigan Compiled Laws, Chapter 418. Worker's Disability Compensation § 418.141

(a) That the employee was negligent, unless it shall appear that such negligence was wilful.

(b) That the injury was caused by the negligence of a fellow employee.

(c) That the employee had assumed the risks inherent in or incidental to, or arising out of his employment, or arising from the failure of the employer to provide and maintain safe premises and suitable appliances.