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We meet some of the people fighting food fraud around the world. Manuela Saragosa asks what risks the consumer faces when they buy food that has reached super-market shelves via a complicated global supply chain, and speaks to some of the people working to improve the traceability of our food.

We meet the 'wine police' asked to investigate the origins of a $26,000 bottle of Petrus. Also, the leader of the 'flying squad' of the Danish Food Administration talks about what happens when the food company you are investigating only has a mailbox for an address. Plus, tracing food at an atomic level - how a new method for detecting food fraud has its origins in crime scene investigations.

(Photo: From left, a bottle 1990 Bordeaux's Chateau Petrus, a 1996 Le Montrachet Grand Cru, a 1989 Musigny Grand Cru, a 1985 La Romanee and a bottle of 1986 Chateau d'Yquem of 1986. Credit: Feferberg/AFP/Getty Images)