Updated - December 09, 2025 11:03 am IST - Kolkata Special Intensive Revision (SIR) assistance centre in Kolkata. File | Photo Credit: ANI Kolkata The Election Commission of India on Monday (December 8), started a duplicate voter identification process, where a new feature was added to the Booth Level Officer’s application in West Bengal to identify and verify duplicate voters. Five new electoral observers have been appointed for the Special Intensive Revision (SIR) in the State to oversee the entire process.