Runell King said Kennedy High school employees improperly inflated students' grades from failing to passing. He was fired and has since hired an attorney.
The school had, by far, the most tests voided due to irregularities of any school in the state. A lawyer for Kennedy's charter group said the issue will be added to an ongoing investigation into other problems, including alleged grade-fixing.
Law firm will investigate grade changes at Kennedy High School and allegations that CEO falsified board records related to a lucrative bus contract.
The district previously found no evidence of wrongdoing. But officials have received new information prompting them to take another look.
Runell King says he discovered evidence that Kennedy employees improperly inflated students' grades. He sent it to top administrators and was fired soon after. The CEO of the school's charter network denies the allegations, saying the changes were made to correct a software error.