Maryland Health - General Section 24-209
§ 24-209.
  (a)   In this section, "customer" means an individual who:
    (1)   Suffers from Crohn's disease, ulcerative colitis or any other inflammatory bowel disease, or any other medical condition that requires immediate access to a toilet facility; or
    (2)   Utilizes an ostomy device.
  (b)   At the request of a customer, and where a public restroom is not readily available, each retail establishment with 20 or more employees that has a toilet facility for its employees shall allow the customer to use the facility.
  (c)   Notwithstanding any provision of this section, an employee toilet facility is not to be considered a public restroom.