Provides that if a retail establishment has a restroom facility on its premises for the use of the retail establishment's employees, a customer who suffers from an eligible medical condition must, upon request, be allowed to use the restroom facility during normal business hours if certain conditions are met. Specifies that a customer who uses the retail establishment's employee restroom facility is responsible for leaving the restroom facility in the same condition as when the customer entered the restroom facility. Provides immunity from civil liability for any act or omission in allowing a customer to use an employee restroom facility if all of the specified conditions for use of the facility are met, provided that the act or omission: (1) is not willful or grossly negligent; and (2) occurs in an area of the retail establishment that is not accessible to the public. Imposes a maximum $100 civil penalty on an owner, operator, or employee of a retail establishment for violating these provisions.