Americans with Disabilities Act (ADA) of 1990 (with amendments issued through 2008)

(i) a failure of a private entity which operates a demand responsive system and which is not subject to section 12184 of this title to operate such system so that, when viewed in its entirety, such system ensures a level of service to individuals with disabilities, including individuals who use wheelchairs, equivalent to the level of service provided to individuals without disabilities; and