; (3) basic over-the-counter medications appropriate for all age groups; and (4) appropriate transportation to medical facilities in the case of a medical emergency, or an on-call service with the ability to arrive at the CBP facility within 30 minutes. (j) Personnel The Commissioner or the Administrator of General Services shall ensure that each location to which detainees are first transported after an initial encounter has onsite at least 1 licensed medical professional to conduct health screenings. Other personnel that are or may be necessary for carrying out the functions described in this section, such as licensed emergency care professionals, specialty physicians (including physicians specializing in pediatrics, family medicine, obstetrics and gynecology, geriatric medicine, internal medicine, and infectious diseases), nurse practitioners, other nurses, physician assistants, licensed social workers, mental health professionals, public health professionals, dieticians, interpreters, and chaperones, shall be located on site to the extent practicable, or if not practicable, shall be available on call. (k) Ethical guidelines The Commissioner shall ensure that all medical assessments and procedures conducted pursuant to this section are conducted in accordance with ethical guidelines in the applicable medical field, and respect human dignity. 4. Water, sanitation, and hygiene The Commissioner shall ensure that detainees have access to— (1) not less than 1 gallon of drinking water per day, and age-appropriate fluids as needed; (2) a private, safe, clean, and reliable permanent or portable toilet with proper waste disposal and a hand washing station, with not less than 1 toilet available for every 12 male detainees, and 1 toilet for every 8 female detainees; (3) a clean diaper changing facility, which includes proper waste disposal, a hand washing station, and unrestricted access to diapers; (4) the opportunity to bathe daily in a permanent or portable shower that is private and secure