Which law first introduced the term "least restrictive environment" and mandated it as a provision afforded all students with identified disabilities?

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Public Law 94-142 introduced the term "least restrictive environment" and mandated it as a provision afforded all students with identified disabilities. Also known as the Education for All Handicapped Children Act, this legislation enacted in 1975 not only introduced the term "least restrictive environment;" it also regulated the meetings and programs that were used to determine identification and placement within special education services and provided free special education services to all students aged 3 to 21 who were identified with a qualifying disability.

Which Law First Introduced the Term "Least Restrictive Environment" and Mandated