Ben Emmerson QC said 700 people had to be tested for radioactive poisoning.

BBC: Alexander Litvinenko murder was 'London nuclear terror'

Ben Emmerson QC, a UN special rapporteur, said the "exponential" rise of drone technology required a proper legal framework to be put into place.

BBC: MQ-1 Predator unmanned aircraft

Moreover, Ben Emmerson, a United Nations expert on counterterrorism and human rights, announced plans in October to investigate U.S. drone attacks and the extent to which they cause civilian casualties.

CNN: Senate panel gets classified drone document from Obama