Two U.N. human rights investigators say U.S. secrecy about its drone strikes is the biggest obstacle to determining the impact on civilians.
Ben Emmerson and Christof Heyns are also calling on other countries to speak up about when they believe deadly drone strikes are acceptable. They say a lack of consensus risks creating anarchy as more countries acquire the technology.
Emmerson said the U.S. has justified drone strikes against terrorist targets in other countries by arguing that it is engaged in an armed conflict against al-Qaida with no boundaries. He said few other countries have spelled out their own positions.
He addds "the moment that other states start to use this technology in similar ways, we are facing a situation which could escalate into a breakdown of peace and security."
