What's the best way to spot sex trade victims?

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Demand for children and women in the sex trade increases when a global sporting event is taking place, according to research from the University of Dundee. The 'It's a Penalty Campaign' has been set up to stop the exploitation. It will target the Winter Olympics and Paralympics in South Korea, the Commonwealth Games in Australia and the Rugby Sevens in Hong Kong. The charity's founder, Sarah de Carvalho, joins Jenni to explain her work.