MANILA, Philippines — State witness and former Department of Public Works and Highways (DPWH) Undersecretary Roberto Bernardo on Wednesday arrived at the Sandiganbayan to testify in the graft case of former Ako Bicol Rep. Zaldy Co. READ: Ex-DPWH Usec Bernardo to testify in Zaldy Co’s graft case Co’s graft case in the Fifth Division stemmed from the