Ben Emmerson QC

When a US drone kills a jihadi militant in Pakistan has a law been broken? What if the missile kills women and children too? Who can be held to account? HARDtalk speaks to Ben Emmerson, the British lawyer addressing these questions for the United Nations. He says drone strikes and other exceptional counter terror measures simply breed more terror - but does this liberal lawyer really know what's best in the struggle to make the world a safer place?