Tehseen Poonawalla, who calls himself a Congress supporter, and Election Watch convenor VV Rao also sought answers to 21 questions from the EC, in a bid to ensure a transparent poll process.
They flagged the concern a day after an Aam Aadmi Party (AAP) MLA made a "live demonstration" in the Delhi Assembly on how the EVMs could be rigged.
Using an EVM prototype, Saurabh Bhardwaj, the AAP MLA, had claimed that anyone aware of a "secret code" could tamper with the machine by feeding the code into it at the time of casting vote.
"If EVMs cannot be tampered with, it is great. But if they can be (tampered with), it will be out in front of the world," he added.
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Poonawalla said the questions he raised stemmed from the results of February's Pune civic polls in which, he alleged, the total votes polled and counted did not tally in 41 of the 160 wards.
Without naming anyone, he alleged that a "businessman" MP of the BJP from Pune had made "exact predictions" of the civic poll results.
"If there is a discrepancy in the number of votes polled and counted, then we surely have a problem in a democracy," said Poonawalla, adding that using the voter verifiable paper audit trail (VVPAT) alone will not ensure transparency in the poll process.
The VVPAT machine dispenses a slip containing the poll symbol of the party the voter has opted for. The slip drops in a box, but the voter cannot take it home.
Poonawalla suggested to the EC to tally the EVM and the VVPAT votes in 50 per cent of the constituencies in the future.
He also sought to know why the EC was posing a challenge to the theory of "EVM hacking" when it had "already been exposed" in 2010 that the machines could be tampered with, which led to the use of VVPATs.
Rao also asked the EC why was it not using VVPATs in every election in spite of a 2013 Supreme Court direction to that effect.
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