Vehicles are also being checked to ensure that money and liquor are not being used to influence voters.
Top officials in the police and civil administration have held a number of meetings in the last couple of days to plug any loopholes in the election process.
Police have also been told to keep an eye on local criminals.
Varanasi's District Magistrate and Returning Officer Pranjal Yadav has personally been visiting various areas to have first-hand assessment of the ground situation.
The Bharatiya Janata Party (BJP) had launched a major offensive against Yadav and even demanded his removal after he refused permission to Modi to hold a rally at Muslim-dominated Beniabagh locality on Thursday.
However, a number of senior officials said it did not affect his morale and he was working hard to have a "successful" election.
The party had expressed concern whether free and fair polls will be possible in the sacred city but Prakash said there was no basis for such apprehensions.
"We are determined to ensure free and fair polls and there is no ground for such apprehensions," he said.
The Aam Aadmi Party Saturday had announced that it deployed 250 spy cameras across the city to keep a tab on BJP workers, alleging that the saffron party may try to influence voters by offering money and liquor considering huge support for AAP leader Arvind Kejriwal.
Sale of liquor has been banned since Saturday and it will remain so till the end of polling.
The city witnessed a high-voltage campaign in the last three days with Kejriwal, Rahul Gandhi and Uttar Pradesh Chief Minister Akhilesh Yadav holding impressive roadshows to woo the voters.