As a key battleground in this year’s presidential election, Ohio has already seen its share of voting-related litigation. The U.S. Court of Appeals for the Sixth Circuit has already weighed in with several rulings on the counting of provisional ballots and on expanded early voting hours.

But there is another important legal issue peculiar to Ohio that hasn’t gotten much attention so far, though it will be a significant factor should the state’s election tally spark litigation. Under a little-noticed provision of Ohio law, federal election results cannot be challenged in state court.