According to IDEA, every student has the right to a "free and appropriate education" in the "least restrictive environment". This means children with disabilities should be educating side-by-side with their general education peers, receiving needed supports in that classroom. This has been a challenge for many. But, the situation is improving as No Child Left Behind (NCLB) holds our educators for giving an equal education, without exception, to all students.
There is evidence that education for ALL students is improved in inclusive settings. For more information check out these resources: