Michigan Compiled Laws, Chapter 446. Business Regulation § 446.72

(a) The customer requesting use of the employee toilet facility suffers from an eligible medical condition or utilizes an ostomy device.

(b) Two or more employees of the retail establishment are working at the time the customer requests use of the employee toilet facility.

(c) The customer provides the retail establishment with a copy of a statement on a prescription form that indicates the customer suffers from an eligible medical condition or utilizes an ostomy device, signed by a doctor.

(d) The retail establishment does not normally make a restroom available to the public.

(e) The employee toilet facility is not located in an area where providing access would create an obvious health or safety risk to the customer or an obvious security risk to the retail establishment.

(f) A public restroom is not immediately accessible to the customer.