A sensible BBC report 'The Boston Marathon bomber: Caught on film?' and the role of the body the National Digital Multimedia Evidence Processing Lab (unclear whether a public or private body):http://www.bbc.co.uk/news/magazine-22191029
Missing from the article is any mention of the level of human and technical resources needed, thousands of hours of footage take a very long time to assemble, analyse etc to an evidential standard.
Our experience is that CCTV is not the "magic wand" in crime detection; I cannot recall a good commentary on the value of mass citizen footage.
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