They were gathered in the Peruvian jungle, in a ceremonial wooden structure known as a maloca, and their immediate fate was in the hands of tribal shamans dressed in brightly patterned robes. One by one they were called up to drink a shot of foul-tasting dark sludge. ‘At that point,’ says Paul Haylock, ‘the nerves really did start to kick in. I’m thinking, is this the right thing to be doing?’ 

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