"Title II of the [Americans with Disabilities Act] provides that "no qualified individual with a disability shall, by reason of such disability, be excluded from participation in or be denied the benefits of the services, programs, or activities of a public entity, or be subjected to discrimination by any such entity." [42 U.S.C.] §12132 (2000 ed.). A "'qualified individual with a disability'" is defined as "an individual with a disability who, with or without reasonable modifications to rules, policies, or practices, the removal of architectural, communication, or transportation barriers, or the provision of auxiliary aids and services, meets the essential eligibility requirements for the receipt of services or the participation in programs or activities provided by a public entity." [42 U.S.C.] §12131(2). The Act defines "'public entity'" to include "any State or local government" and "any department, agency, … or other instrumentality of a State," §12131(1). We have previously held that this term includes state prisons. See Pennsylvania Dept. of Corrections v. Yeskey, 524 U.S. 206, 210 (1998). Title II authorizes suits by private citizens for money damages against public entities that violate §12132. See 42 U.S.C. § 12133 (incorporating by reference 29 U.S.C. § 794a)."