Perhaps in response to Jay Mathews's column, at least some of the DC data was released:

After months of FOIA requests and general nagging, the Office of the State Superintendent of Education has finally released data that appear to show rates of suspicious DC CAS answer sheet erasures continuing to decline in 2011.

An analysis of 2011 reading, math, science and biology exams by their publisher, CTB/McGraw-Hill, shows that 128 classrooms in public and public charter schools in the District had high rates of wrong-to-right erasures.

That's a drop of nearly 50 percent from 253 classrooms in 2009. The 128 classrooms represent less than 3 percent of the total number of classrooms in which students were tested.

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Suspicious DC CAS erasures down in 2011, but OSSE withholds school-by-school data

By Bill Turque

http://www.washingtonpost.com/blogs/dc-schools-insider/post/suspicious-dc-cas-erasures-down-in-2011-but-osse-withholds-school-by-school-data/2011/12/31/gIQA9s7pSP_blog.html