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Perhaps the most significant finding presented by Danielson and Bellamy (see previous article) is consistency of the application of least restrictive environment (LRE) over time while there is such a significant variation in that application between states. This article suggests that LRE as a concept is semantically and traditionally loaded with location rather than service due to the greater ease with which location-related applications can be made.
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James A. Tucker (1989) studied this question.
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