For most individuals who think of a landmark decision pertaining to education and court decisions which attempts to eliminate disparate treatment, Brown v. Board of Education immediately comes to mind. However, Olmstead v. L.C. and E.W (June 22, 1999) was the landmark decision that protected and recognized the disparate treatment of individuals with disabilities within American school systems. In this decision, the Supreme Court segregating individuals with disabilities in institutional settings deprives them of essential civil rights and liberties that persons with non-disabilities enjoyed.
More information can be found at http://www.justice.gov/crt/opa/pr/speeches/2012/crt-speech-120621.html.