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Some Indian tea plantations stamped slavery-free are abusing and underpaying their workers, according to new data that experts said could erode consumer trust in ethically-sourced products.

A study from Britain’s Sheffield University, revealed exclusively by the Thomson Reuters Foundation on Thursday, showed certification schemes by groups such as Fairtrade and Rainforest Alliance are failing to stop labour exploitation.

The report found little difference in the conditions of about 600 tea workers surveyed on certified and non-certified farms in Assam and Kerala, India’s major tea producing regions.