"Evidence submitted by the British government in court today proves, beyond any doubt, that Boris Johnson has been point blank lying about the degree of certainty Porton Down scientists have about the Skripals being poisoned with a Russian “novichok” agent.
Yesterday in an interview with Deutsche Welle Boris Johnson claimed directly Porton Down had told him they positively identified the nerve agent as Russian:
You argue that the source of this nerve agent, Novichok, is Russia. How did you manage to find it out so quickly? Does Britain possess samples of it?
Let me be clear with you … When I look at the evidence, I mean the people from Porton Down, the laboratory …
So they have the samples …
They do. And they were absolutely categorical and I asked the guy myself, I said, “Are you sure?” And he said there’s no doubt.
Porton Down have actually said:
Blood samples from Sergei Skripal and Yulia Skripal were analysed and the
findings indicated exposure to a nerve agent or related compound. The samples
tested positive for the presence of a Novichok class nerve agent or closely related agent."
read more: source