Voter-verified paper audit trail
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Voter verifiable paper audit trail (VVPAT) or verified paper record (VPR) is a method of providing feedback to voters who use an electronic voting system. A VVPAT allows voters to verify that their vote was cast correctly, to detect possible election fraud or malfunction, and to provide a means to audit the stored electronic results. It contains the name and party affiliation of candidates for whom the vote has been cast. While VVPAT has gained in use in the United States compared with ballotless voting systems without it, hand-marked ballots are used by a greater proportion of jurisdictions.[1]
As a paper-based medium, the VVPAT offers some fundamental advantages over an electronic-only recording medium when storing votes. A paper VVPAT is readable by the human eye and voters can directly interpret their vote. Computer memory requires a device and software which is potentially proprietary. Insecure voting machine[2] records could potentially be changed quickly without detection by the voting machine itself. Auditable paper ballots make it more difficult for voting machines to corrupt records without human intervention. Corrupt or malfunctioning voting machines might store votes other than as intended by the voter unnoticed. A VVPAT allows voters to verify their votes are cast as intended, an additional barrier to changing or destroying votes.
The VVPAT includes a direct recording electronic voting system (DRE), to assure voters that their votes have been recorded as intended and as a means to detect fraud and equipment malfunction. Depending on election laws, the paper audit trail may constitute a legal ballot and therefore provide a means by which a manual vote count can be conducted if a recount is necessary.
In non-document ballot voting systems – both mechanical voting machines and DRE voting machines – the voter does not have an option to review a tangible ballot to confirm the voting system accurately recorded their intent. In addition, an election official is unable to manually recount ballots in the event of a dispute. Because of this, critics claim there is an increased chance for electoral fraud or malfunction and security experts, such as Bruce Schneier, have demanded voter-verifiable paper audit trails.[3] Non-document ballot voting systems allow only a recount of the "stored votes". These "stored votes" might not represent the correct voter intent if the machine has been corrupted or suffered malfunction.
As of 2024, VVPAT systems are used in countries including the United States, India,[4] Venezuela,[5] the Philippines,[6] and Bulgaria.[7] In the U.S., 98.5 percent of registered voters live in jurisdictions offering some form of paper ballot, whether hand-marked or VVPAT. Only 1.4 percent use electronic systems with no paper record.[8]
