The Voter Verifiable Paper Audit Trail (VVPAT) system, which allows voters to verify that their vote has been recorded correctly by the Electronic Voting Machine (EVM) and provides a paper trail for auditing, was first used by the Election Commission of India on a trial basis. The first deployment of VVPATs occurred in a by-election for the Noksen Assembly Constituency in Nagaland held on September 4, 2013.