Pick up a packet of tea from any major brand at the supermarket and you’ll likely see labels promising consumers the tea inside is ethically sourced.

Certification schemes like Rainforest Alliance and Fairtrade are meant to ensure tea workers are paid a minimum wage, have safe working and living conditions and can access basic necessities like clean drinking water on tea estates.

But do they?

A Foreign Correspondent investigation in Sri Lanka has found several certified estates on the supplier lists of the world’s biggest brands were failing to live up to these ethical promises.