Philippine National Police (PNP) Director General Ronald Dela Rosa (2nd L) takes the oath during the start of a hearing investigating drug-related killings at the Senate headquarters in Pasay city, metro Manila, Philippines August 22, 2016. Also pictured are (L-R) Roselyn Borja, officer-in-charge of the Philippine Drugs Enforcement Agency (PDEA), Gwendolyn Pimentel-Gana, member of of the Commission on Human Rights, and Jose Luis Martin Gascon, chairperson of the Commission on Human Rights. REUTERS/Romeo Ranoco