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The Colombian city of Medellin has become notorious for its drug gangs. But one crime-fighting duo are determined to put an end to the drugs trade. Narcotics police officer William Marin and his police dog Choko have gained a high reputation for their ability to bust drug traffickers. But their success has also led them to danger, as our reporter Dimitri O'Donnell found out. Image: Narcotics police officer William Marin and his police dog Choko Credit: Dimitri O'Donnell