Police Constable Yasa Amerat poses for a photograph with a body-worn video (BWV) camera, before a year-long trial by the Metropolitan police, at Kentish Town in London May 6, 2014. During the trial 500 cameras will be given to officers, with the aim of recording evidence at crime scenes, local media reported. Photograph taken on May 6, 2014. REUTERS/Yui Mok/Pool (BRITAIN - Tags: CRIME LAW SOCIETY)