The use of force by private security firms is a "fact of modern life" but it should be subject to far greater controls and accountability. This is according to a top UN human rights investigator. Christof Heyns, who's the UN Human Rights Council Special Rapporteur on extrajudicial killings and the right to life, was speaking at the Geneva assembly where he presented a new report. In recent months Heyns has also visited Ukraine and Burundi. He elaborates....