The DeKalb County district attorney's office is investigating allegations that two elementary school administrators changed answers on Georgia standardized tests to improve students' scores. Don Geary, assistant to the district attorney, told The Atlanta Journal-Constitution on Wednesday that those responsible could be charged with tampering with state documents, which is a felony. The cheating came to light in a state audit released last week, revealing discrepancies on the fifth-grade math Criterion-Referenced Competency Test answer sheets in four school districts. State officials do not believe students are to blame. The audit led to the resignation of Atherton Elementary principal James Berry and the reassignment of assistant principal Doretha Alexander. Neither has returned repeated requests for comment.