Teachers in three District classrooms cheated last year on high-stakes standardized tests, according to the results of an investigation released Friday morning by the Office of the State Superintendent, The Washington Post reports.

Superintendent Hosanna Mahaley said the probe’s findings show that the vast majority of the city’s school staff and students are “playing by the rules” on the D.C. Comprehensive Assessment System — the standardized test used to measure student achievement and teacher effectiveness.

“Widespread cheating was not found,” Mahaley added.

D.C. test scores have come under increasing scrutiny since USA Today published a March 2011 investigation showing an unusually high number of erasures from wrong to right answers in more than 100 D.C. public schools between 2006 and 2010.

In response, Chancellor Kaya Henderson asked D.C. Inspector General Charles J. Willoughby to examine the newspaper’s findings. U.S. Education Department officials have since joined the review.

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staff and wire services reports