From Mountain of CCTV Footage, Pay Dirt: 2 Arrests in Spy Poisoning The poisoning of a former Russian spy led to a landmark test of an investigative technique Britain has pioneered: accumulating mounds of visual data and sifting through it. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Tariq Ramadan Is on Leave From Oxford After Rape AllegationsTrusted Netanyahu Adviser Caught Up in Corruption InquiryThe Paradise Papers: How Business Titans, Pop Stars and Royals Hide Their Wealth10 North Koreans Detained in China; ‘We Fear the Worst,’ Activist SaysCommunists Mark Russian Revolution’s Centenary in MoscowIn U.K.’s Clubby Parliament, Abuse Complaints Became Weapons