Piece by piece, forensic pathologist Raquel Fortun puts together dozens of human bones like a puzzle in her search for truth about the violent deaths of drug war victims in the Philippines.

One of only two forensic pathologists in the country, Fortun is helping rights groups gather evidence that one day could be used in court against police accused of carrying out extrajudicial killings.

"I know they were killed violently and yes, I do whisper things to them. I do ask for help," said Fortun.