This introductory chapter illustrates why evidence in the individual communications procedure of the United Nations human rights treaty bodies (UNTB) is an issue requiring reflection and clarification. The chapter firstly contextualises this central topic of this book by broadly introducing the UNTBs’ mandates, composition and ways of working, as well as some general features of their individual communications procedures. Indications are given of how this legal, institutional and procedural setting interacts with the handling of evidence by the UNTBs, as well as some of the key questions it raises. The chapter further outlines some of the particular research challenges encountered in tackling the questions at the heart of this book, and how they have been addressed. It then goes on to introduce the four-part structure of the book and its ten chapters, including the final chapter, containing recommendations. Finally, this introduction discusses cross-cutting themes which emerge from the contributions.

This chapter reviews the Working Group on Arbitrary Detention’s (WGAD) approach to issues of evidence and burdens of proof. It aims to provide a useful point of comparison with the UNTBs’ evidentiary procedures. The WGAD has developed an increasingly sophisticated approach to evidence, providing strong incentives for other decision-making bodies to take up its conclusions and procedures. In this chapter, the following arguments are substantiated: first, that the Working Group’s increasingly formalised and standardised approach to evidence reflects the maturing of the Working Group and its entrenchment in the ecosystem of human rights bodies; second, that its nuanced evidentiary approach can serve to enhance its credibility with states and claimants, in order to increase compliance rates; and third, its detailed approaches to evidentiary standards and challenges could provide precedents for UNTBs with individual claims mandates to follow a similar approach.

Over decades of reviewing individual communications, the Human Rights Committee (HRC) has developed greater consistency when shifting the evidentiary burden between the author and the state in its decisions on individual communications. The grounds on which this shift is made, including the nature of the allegations, the evidence used to corroborate the allegations, and the extent to which the state engages with the process, seem to impact the articulation of the shifted burden in certain cases. To effect this burden shift, the chapter explains that the HRC appears to follow three steps when assessing claims of a breach of the prohibition against torture: (1) the allegations must be corroborated by some level of evidence; (2) the HRC applies a rebuttable presumption that the author’s alleged facts are true; unless (3) the state offers evidence in direct response to the specific allegations of torture.