Sergei Skripal...and his daughter, Yulia, weren’t the only people affected by a nerve-agent attack in Salisbury, England, in March....A swarm of hazmat-suited chemical warfare experts inspected every place the Skripals had been recently in the hope of finding out what happened and whether there was still a danger to the public. U.S. intelligence agencies have been on the hunt for a technology that would make such investigations faster and safer and perhaps even prevent this kind of attack altogether.