The lead scientific adviser to police in the wake of the Salisbury poisonings said it is highly likely “many lethal doses” of the nerve agent were applied to Sergei Skripal’s door handle.
The Defence Science and Technology Laboratory (DSTL) witness, known only by the cipher MK26, told the Dawn Sturgess Inquiry that a sample the size of “a third to a sixth of a grain of salt” of the Novichok chemical used in the poisonings could have proved to be a fatal dose for a human.
