Incredible post by a teacher explaining why and how his school cheated. Great level of detail. Read it. Given the situation in Atlanta and in other cities across the country, this is a timely discussion.
At an old school I worked at, one self-contained teacher told me that during our state test she stopped her students, explained how to do a problem, and then let them continue working. It was the sort of thing where I almost didn't believe her because even if someone is inclined to cheat, I can't understand at all why you would mention it to coworkers. It was truly bizarre. I have no doubt that this type of thing happens more than we expect.
If it's happened to you, or at your school, I would be interested in hearing a comment from you. I suspect other readers would be as well.