we took our evidence to professor tomoya obokata, the united nations special rapporteur on contemporary forms of slavery. why is accountability throughout the supply chain voluntary and opaque, with no international regulation, despite corporate promises and clear guidelines from the un? we spoke to a senior executive who works with the fragrance house givaudan. they agreed to speak to us if we didn't reveal their identity. what you first need to realise is that the relationship between the master and the fragrance house is an informal and trust—based relationship. if a human rights issue in the supply chain comes up, the masters meet with the fragrance house directly. the masters would never carry out specific checks at the factories or fields, for example. instead, they rely on us to instruct third—party auditing companies to prove that due diligence checks have been done. two of the main auditing firms that the masters and fragrance houses use are sedex and uebt. sedex is a global membership organisation that helps identify and manage ethical sourcing risks. the uebt ethical biotrade