Brazil. In Brazil's Amazon frontier, modern slaves are trapped in debt bondage and forced labour, cutting down the rainforest to make wayfor cattle ranches. The landowners enjoy impunity and are free to export their beeftothe UK. Olenka Frenkiel joins a federal squad on a raid of a ranch. But can Brazil keep its promise to get rid of slavery by the end of the year? Editor Maria Balinska Repeated Monday 8.30pm