TSQ's comment made me think of something we discussed in graduate school yesterday. Almost all Deaf individuals who are black or Hispanic almost always have been labelled as mental retarded (I know ID is better but that's how it's documented- I don't like the former but..) at one point in their formative years.
It has do with cultural and socioeconomic differences that are not accounted for in evalutations
I wonder if we removed any documentations of ethnicities like job or school applications or especially Census forms, would it affect education. It may be harder to see issues. I don't know