Election Commission Presiding Officers of all booths, particularly in West Bengal, have been directed to check and ensure that all candidate buttons on the Electronic Voting Machines (EVMs) are clearly visible and not covered with tape, glue or any other material including colour, ink, perfume or chemicals which may compromise the secrecy of the votes.In cases where candidate buttons are found with the above discrepancies, they fall under tampering or interference with Electronic Voting Machines (EVMs), which is an electoral offence.Election Commission officials on Tuesday said the commission will not hesitate to take criminal action or order re-polling in such cases.Wherever cases of molestation come to light, the Presiding Officer will immediately inform the Sector Officer or Returning Officer.