July 6 2018 5:47pm

UK police searching for source of Novichok in Amesbury, England

British Police are working on the theory that Dawn Sturgess and her boyfriend Charlie Rowley handled an object contaminated with the nerve agent Novichok; probably remnants from the March attack on Sergei and Yulia Skripal. But as Redmond Shannon reports, experts disagree as to whether discarded traces of the nerve agent could stay potent for four months.

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