This paper was written at the request of the LJIL editorial board as a reply to the article by Karemaker, Taylor, and Pittman published in the previous issue. It is argued that their position starts from incorrect assumptions and that their overall assessment of proofing is flawed, especially with regard to the risks for fair trial. As to the law of the international tribunals it is acknowledged, however, that there is a structural and normative difference between the ICTY (as the most important ad hoc tribunal) and the ICC. While the former still follows, despite some normative changes, a predominantly adversarial procedure, the ICC Statute provides for a mixed adversarial–inquisitorial procedure. Such a procedural model is not compatible with the adversarial origins of witness proofing and it is therefore not surprising that the ICC Statute does not provide for this technique. As a consequence, at the ICC proofing is neither legally admissible nor necessary.