ADRIAN PORTUGAL  FAMILIES of people killed in the Philippines' war on drugs are hopeful that a formal investigation into possible crimes against humanity approved by judges from the International Criminal Court earlier this week will result in justice for the victims. Rights groups say Philippines' President Rodrigo Duterte incited deadly violence and accuse police of murdering unarmed suspects on a massive scale as part of the anti-narcotics campaign launched in 2016. "I am grateful that our situation and the killing of my brother are being paid attention to," Mary Jane Gerangco, 40, told Reuters in Manila. "Our hope is that…