Funding agreements for humanitarian action frequently include restrictions and requirements in their grants that aim to ensure that recipients of the funding comply with counterterrorism measures and sanctions adopted by the donor. These measures can be problematic if they prevent humanitarian actors from operating in accordance with humanitarian principles or are incompatible with international humanitarian law. While attention has focused primarily on requirements in grants for humanitarian action, increasingly donors to development work have also started including sanctions- and counterterrorism-related restrictions in their grants. The present article focuses on one such measure that is currently a live concern: requirements to screen and, thus, potentially exclude final beneficiaries. It explains why these requirements go over and above what sanctions and counterterrorism measures require, and why they are inconsistent with humanitarian principles and international humanitarian law. The article also explores the position in relation to development interventions.