US and Australian crime fighters are preparing Cambodia for a spike in online child sex abuse cases but local officials fear that predators are a step ahead of police due to narrow laws.The spread of cheap, high-speed internet and the rise in mobile phone ownership is fuelling cybersex trafficking across Southeast Asia – a form of modern-day slavery where children are abused and raped over live-streams for paying clients worldwide.Agents from the FBI and Australian Federal Police (AFP) have in…