The Indiana Department of Education has reason to believe security was breached during this week's I-STEP testing.
That means tens of thousands of scores may have to be thrown away.
The DEA says an essay question for the test was leaked.
Officials think a test coordinator copied the question and shared it with others. One eventually posted it on a Facebook page connected with a teachers group.
The question apparently asked students their opinion on school vouchers.
The test results of about 80,000 8th graders may have to be invalidated.