Which case clarified the ongoing placement requirements related to least restrictive environment (LRE)?

The case that clarified the ongoing placement requirements related to the least restrictive environment (LRE) is indeed relevant and pivotal in the context of special education law. The significance of this case lies in its reinforcement and interpretation of the Individuals with Disabilities Education Act (IDEA), which emphasizes the necessity of providing educational placements for students with disabilities that are as close to the general education setting as suitable while meeting their unique needs.

This case specifically outlined the responsibilities of educational institutions to ensure that students with disabilities are not only placed in the least restrictive environment initially but also maintained in that environment as long as it meets their educational needs adequately. It addressed the concept that regular education settings can often be beneficial for students with disabilities, thereby promoting social integration and academic progress.

The other cases listed, while they may address important legal principles, do not focus specifically on the LRE mandates of special education law. For example, Tarasoff v. Regents deals primarily with duty of care in mental health settings, Brown v. Board of Education addresses issues of racial segregation in schools, and Roe v. Wade focuses on reproductive rights, none of which pertains to the specifics of educational placement or the requirements of LRE.