have been found, from feeding ballots upside down, multiple ballots pulled through at once in central counts, paper jams, broken, blocked or overheated sensors which misinterpret some or many ballots, printing which does not align with the programming, programming errors, and loss of files. The cause of each programming error is rarely found, so it is not known how many were accidental or intentional.

Direct-recording electronic (DRE)

In a DRE voting machine system, a touch screen displays

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