MANILA, Philippines — Only Vice President Sara Duterte and her former security officer Col. Raymund Dante Lachica knew how the P500 million confidential funds of the Office of the Vice President (OVP) were spent, a witness for the prosecution said on Wednesday, the 19th day of the impeachment trial of the vice president.OVP Assistant Chief of Staff Lemuel Ortonio said that it was his understanding that Duterte, as head of the agency, would have …