Delhi ramps up voter verification ahead of Dec 4 roll. Delhi's 14,947 Booth Level Officers (BLOs) have been tasked with verifying at least 10 electors daily under the Special Intensive Revision (SIR) exercise. Over 1.3 million of 3.3 million noticed electors are verified so far. All notices, claims, and objections must be resolved by November 30, ahead of the final electoral roll publication on December 4.