Research ethics committees (RECs; known as institutional review boards (IRBs) in the USA) are an integral part of the human research participants' protection system. [1] They have the authority to approve, conditionally approve or reject research proposals, depending on the committee's determination of a study's ethical acceptability, as judged in terms of local and international guidance. [1] Unfortunately, RECs generally operate behind closed doors, meaning that there is little understanding of REC reviews in practice. Two books, Behind Closed Doors: IRBs and the Making of Ethical Research [2] and Ethics Police: The Struggle to Make Human Research Safe, [3] provide important insights into the work of IRBs in the USA. However, research into the operation of RECs is still relatively limited in developing countries such as South Africa (SA). While RECs play an important role in ensuring the protection of research participants, they are often heavily criticised for overstepping their scope, being too bureaucratic, delaying important research and spending too much time rewording informed consent forms. [3,4] Some social science commentators have even called for the abolition of REC reviews, arguing that mandatory ethics review is itself unethical because RECs do not respect researchers or each other, lack merit and integrity and are neither just nor beneficent. [5] Despite such criticism, there have been relatively few empirical studies exploring the work of RECs, although some studies [6-9] have examined REC minutes and decision letters retrospectively to identify the ethical issues raised, both internationally and in SA. These studies This open-access article is distributed under Creative Commons licence CC-BY-NC 4.0.