EMMA BATHA TECHNOLOGY that helped catch a U.S. serial murderer, dubbed the Golden State Killer, could be used to track down aid workers who sexually abuse girls and women overseas, according to the team behind a groundbreaking project in the Philippines. In abuse cases which result in pregnancy, scientists say DNA could be taken from the child with the mother's consent and uploaded to a genealogy database to trace the father. The technology has been made possible by the popularity of commercial genealogy services which now hold DNA data on millions of people keen to explore their ancestry. "I'm really…