Agnes Callamard: Investigating the Khashoggi and Soleimani killings

There are international laws and norms designed to prohibit states from bumping off their enemies, internal or external. But look around the world, and its clear those laws are being violated, often with impunity. Stephen Sackur interviews Agnes Callamard, a renowned human rights investigator who serves as the UN Special Rapporteur on extra judicial killing. Given the scale of the problem, have her investigations become an exercise in futility?