410 ILCS 39/15: Liability.

(a) A retail establishment or an employee of a retail establishment is not civilly liable for any act or omission in allowing a customer that has an eligible medical condition to use an employee toilet facility that is not a public restroom if the act or omission meets all of the following:

(1) It is not willful or grossly negligent.

(2) It occurs in an area of the retail establishment that is not accessible to the public.

(3) It results in an injury to or death of the customer or any individual other than an employee accompanying the customer.

(b) A retail establishment is not required to make any physical changes to an employee toilet facility under this Act.