Which legal case determined that Spanish-speaking students should be retested in their native language to avoid errors in placement?

The case that determined Spanish-speaking students should be retested in their native language to avoid errors in placement is Diana v. Board of Education (1970). This landmark decision highlighted the necessity of assessing students in their primary language, ensuring that their abilities were not misinterpreted due to language barriers. The ruling acknowledged that standardized tests administered in a second language could lead to inappropriate placement in special education programs for students who were bilingual or multilingual. By focusing on administering tests in the native language, the court aimed at promoting equity in educational opportunities and ensuring that students received appropriate support based on their actual abilities rather than their language proficiency. This foundational principle continues to influence educational practices and policies regarding the assessment and placement of bilingual students.