DEHRADUN: The chief electoral officer (CEO) of Uttarakhand, Saujanya (who only uses her first name), announced on Friday that Voter Verifiable Paper Trail machines (VVPATs) will be used in all polling booths in Uttarakhand in the forthcoming Lok Sabha polls.The district returning officers-cum-district magistrates have been given necessary instructions regarding the use of VVPAT machines in all polling centres here.Election commission officials are holding mock polls in the state to show the safety of EVMs and VVPATs.