School choice opponents frequently claim the Washington, D.C., school voucher program is a failure. But I have a hunch that’s going to change pretty soon.

The previous federal evaluation of the D.C. Opportunity Scholarship Program found negative effects on math test scores and no effects on reading test scores after two years. But the most recent evaluation, just released Wednesday, found that winning a lottery to use a voucher to attend a private school in D.C. had no effects on math or reading test scores after three years.