At a symposium Tuesday at the U.S. Education Department, Henderson said that without such guidelines, school districts will be second-guessed in their efforts to investigate and punish misconduct. The comments come amid ongoing scrutiny of the district's approach to possible cheating.
Alleged cheating at D.C. Public Schools is being investigated by the D.C. inspector general and by the federal Education Department. Henderson asked for an outside probe after USA Today revealed high levels of answer sheet erasures correcting wrong answers at more than 100 schools.
In Atlanta, state investigators with subpoena power aggressively investigated alleged cheating and found widespread cheating at 44 schools.