Story by Carter Walker of Votebeat

This article is made possible through Spotlight PA’s collaboration with Votebeat , a nonpartisan news organization covering local election administration and voting. Sign up for Votebeat’s free newsletters here .

Pennsylvania’s Chester County has reviewed more than two-thirds of the provisional ballots cast on Election Day, and confirmed that it has begun counting eligible ballots, though officials still cannot explain what caused a pollbook error that forced independent and third-party voters to use provisional ballots.

County officials said they hope to have the answer by December, after an investigation by an outside firm.

Pollbooks are the lists of registered voters that workers use to check in voters at the polling place. Bu

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