EVMs tamper-proof, problem with VVPATs: Former EC Chief
Former Chief Election Commissioner Navin Chawla on Saturday defended the Electronic Voting Machines (EVMs) saying they are tamper-proof and have been used comprehensively in the 2004, 2009 and 2014 general elections. He further said that the problem lies with the Voter Verifiable Paper Audit Trails (VVPATs), as their use has recently started, and their error rate is 5% and higher.  