Noting that the Election Commission (EC) had deleted 45,836 entries in the electoral roll, following a verification on a representation made by the DMK, a bench of justices T S Sivagnanam and K Ravichandrabaabu said these deleted figures were not minimal or negligible.
The deleted entries included multiple entries of same voters with a different address or age.
This sort of entries, if not found and corrected at the appropriate time, would have resulted in bogus voting, as rightly contended by the petitioner, the bench said, adding that it was needless to say that even a single vote might change the outcome of the bypoll.
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The punishment against those persons must be "severe in nature, even to the extent of banning" them from voting in or contesting an election permanently, it said.
"Unless such strong measures are taken and messages sent, this sort of evil attempts will continue, which will only result in a mockery of democracy," the bench said.
The bypoll in the RK Nagar Assembly constituency is scheduled to be held on December 21 to fill the vacancy caused by the death of its sitting MLA and late Tamil Nadu chief minister J Jayalalithaa last year.
The order was passed on a miscellaneous petition filed by the DMK, seeking to re-open its PIL regarding the voters' list, on the ground that it still contained multiple entries of voters' names.
The bench, in its order, appreciated the main opposition party in the state for the steps taken by it to purify the electoral roll.
Earlier, on November 21, the first bench of the court, headed by Chief Justice Indira Banerjee, had disposed off the PIL filed by the DMK, seeking a door-to-door verification of the voters' list, as infructuous after recording a submission of the EC that 45,836 names of voters were deleted.
The DMK had moved the court again, contending that about 5,000 more entries needed to be deleted from the list.