Abstract Documentary mediums have been called upon to refute denials of mass suffering throughout the twentieth century. This essay argues that refutation is a documentary impulse as definitive as the mission to amplify marginalized voices. Moreover, patterns in refuting denials of harm and moral responsibility indicate shifting conditions of public grievability. Comparing over a dozen documentaries about Prevention through Deterrence—a border control strategy nationalized under the Clinton administration—the analysis shows that migrant fatality maps and forensic lab footage not only document death but also refute commonplace denials of migrant human rights.