Spy Poisoning: Porton Down Laboratory Unable To Identify 'Precise Source' Of Nerve Agent

The UK’s Porton Down laboratory has been unable to identify the “precise source” of the Novichok nerve agent that poisoned a Russian double agent in Salisbury last month.Gary Aitkenhead, the chief executive of the Defence Science and Technology Laboratory (DSTL) in Wiltshire, said it had not been able to prove that the poison was created in Russia.But he made clear that it was for the Government to “piece together the conclusions” through a “number of oth