When you have a nerve agent or whatever, you check it against certain samples that you retain in your laboratories. And Porton Down, as we now all know, is the largest military facility in the United Kingdom that has been dealing with chemical weapons research. And it's actually only eight miles from Salisbury.
>> You're not suggesting that Porton Down is responsible for this nerve agent?>> I don't know. I don't have any evidence of anything having been used.