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.

Pushbacks are designed to prevent people on the move from accessing procedural and/or substantive legal safeguards. States thus tend to deny practising them and actively erase evidence of their occurrence. The resulting acute evidentiary challenges in any subsequent human rights litigation require adjustments to be made to the evidentiary framework. This chapter offers a four-branch matrix of what can logically happen to facts disputed in litigation. It then proceeds to critically examine how evidentiary issues have been handled in UNTB pushback case law, concluding the right findings have been made, but on a generally weak reasoning. The chapter finally stresses that the burden of proof should be shifted from complainant to state when two conditions are met: a context-proven to a high standard, such that the state can be presumed to have violated human rights; the complaint is linked to this context – with this proven prima facie. If the linkage is evidenced to a higher standard, the factual allegations must be recognised as established on the strength of the evidence –without any shift being alluded to, so as to avoid an upward slippage in the purposefully low standard of proof applied.