So, when did Rhee know there was a cheating problem?

Besides the obvious, that is?

At least January of 2009, at which time she had a district official who was working on "the erasure study". That is how it is described in the so-called 'lost memo' which has finally been provided to John Merrow (PBS, The Education of Michelle Rhee, Frontline) by an anonymus source.
Let's be clear here, it's the same kind of pattern of evidence that is the basis of 35 criminal indictments in the Atlanta Public Schools, announced in early April. Highly improbable rates of 'wrong-to-right erasures' were observed. Someone was given the task of studying the issue. At least two audits (dog-and-pony shows, or shell games, take your pick) were carried out, with a minimum of direct information from teachers, and without looking at test documents. Not surprisingly, they found nothing to substantiate suspicions. Well, that's like asking me if I ran that red light. I'll say no. If you take me at my word, without checking the red-light camera, or talking to witnesses who were at the corner, then you are an idiot and have earned the label. That's basically what happened in DC. That's also what happened in the first 'investigation' in Atlanta. Until Governor Perdue (not Deal, but Purdue before he lost the election) appointed an outside, unbiased commission to REALLY look into it. They did a thorough job, unlike the prior team which hit miltiple schools in a single day an proudly announced that they found nothing. It has been slow going since then, with almost 180 educators coming under suspicion, and now 35 indicted. When will DCPS take this seriously?