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LONDON, ENGLAND - OCTOBER 07: A visitor views a display on police procedures at the 'Met Crime Museum Uncovered' exhibition on October 7, 2015 in London, England. Running from October 9, 2015 until April 10, 2016, the exhibition will display never seen before objects from the Metropolitan Police's Crime Museum, which until now has only been open to staff and invited guests. (Photo by Ben Pruchnie/Getty Images)

LONDON, ENGLAND - OCTOBER 07:  A visitor views a display on police procedures at the 'Met Crime Museum Uncovered' exhibition on October 7, 2015 in London, England. Running from October 9, 2015 until April 10, 2016, the exhibition will display never seen before objects from the Metropolitan Police's Crime Museum, which until now has only been open to staff and invited guests.  (Photo by Ben Pruchnie/Getty Images)