I'm sure they do

APS officials want erasure analysis thrown out
[WSB-TV] The lawyer for four high-ranking Atlanta Public Schools officials told Channel 2 Action News he will ask a judge to throw out an erasure analysis that is key to many of the allegations against his clients in the CRCT cheating scandal.
Attorney George Lawson represents SRT Executive Directors Tamara Cotman, Dr. Sharon Davis-Williams, Dr. Robin Hall and Michael Pitts. Lawson spoke exclusively to Channel 2 investigative reporter Mark Winne about why he alleges the erasure analysis is flawed and should not be used against his clients. Lawson told Winne regarding the 2009 and 2010 CRCT erasure analysis ordered by the Governor’s Office of Student Achievement, “it’s not sound, scientifically and statistically.”
Mike Bowers, one of the governor’s special investigators, counters that claim . “I say he’s totally wrong ," Bowers said. " I think it is absolutely legitimate, solid. I don’t see any reason not to rely on it.”

Of course it's sound. *sigh* I'm telling you, they don't make criminal masterminds like they used to. The thugs SRT directors relied exclusively on fear and intimidation: There was absolutely no cleverness involved.

The company that scores the test has been doing this for years. They've got plenty of statistics to back them up when they say what percentage of wrong-to-right erasures is average, and what percentage is excessive. And GBI forensics are plenty sophisticated enough to tell the difference between sporadic individual corrections and bulk erasures. Heck, we could probably eyeball it if we saw two forms side-by-side.