Mich. Comp. Laws § 408.970

Sec. 10. An employer shall retain for not less than 3 years records documenting the hours worked and earned sick time taken by employees. To monitor compliance with the requirements of this act, an employer shall allow the department access to those records, with appropriate notice and at a mutually agreeable time. If a question arises as to whether an employer has violated an employee’s right to earned sick time under this act and the employer does not maintain or retain adequate records documenting the hours worked and earned sick time taken by the employee or does not allow the department reasonable access to those records, there is a presumption that the employer has violated the act, which can be rebutted only by clear and convincing evidence.