Data matter more than ever in the regulation of borders and migration. An apt illustration of how movement is enabled or restricted by data collection and analytics was recently reported by Eyal Weizman, founding director of the London-based research agency Forensic Architecture that specialises in the production and analysis of evidence about human rights violations by state and corporate actors. Prior to a business trip to Miami where he was supposed to open Forensic Architecture’s first major exhibition in the US that, among other things, displayed investigations into a CIA drone strike in Pakistan and police killings of black US citizens, Weizmann was notified that his visa waiver request had been denied and that he would not be allowed to enter the United States.