In debates on the preemptive measures of the war on terror, criminal law is often regarded as the antithesis to exception-a conventional mode of response that acts on the basis of past harm. Since September 11, 2001, however, significant new terrorism laws have been adopted in most countries in order to make possible the disruption and prosecution of potential terrorists engaged in preparatory activities. Thus, ancillary acts undertaken increasingly in advance of actual violence are brought within the remit of criminal law. This paper engages the question of the precautionary turn in criminal law itself, and how it plays out in actual courtrooms. We examine the terrorist trial as a performative space where potential future terror is imagined, invoked, contested, and made real. By focusing on the cases of the Hofstad group in the Netherlands, and the Rhyme trials in the UK, the paper examines how present criminal offenses involving terrorist aims and intent are constituted through the appeal to potential future violence. In conclusion, the paper teases out the political dynamic of secondary risk management that-frequently-underlies contemporary terrorism prosecutions.In November 2011, a man named Jose Pimentel was arrested in New York on charges of criminal possession of a weapon and conspiracy to build a bomb, with the aim of committing a terrorist attack. At the time of his arrest, Pimentel was in the process of assembling a homemade bomb that was, in the words of police, "about an hour away" from being functional (quoted in Goldstein and Rashbaum 2011). Coinciding with the suspect's appearance in court, New York police and the District Attorney convened a press conference to provide more information on the plot and the suspect. What was remarkable at this press conference was that police brought and demonstrated a model of the bomb that Pimentel 1 Many thanks to two anonymous reviewers of IPS for their very helpful comments and suggestions. We are grateful to the participants of the COST workshop "Uncertain Futures" at the Vrije Universiteit Amsterdam in January 2012, especially Claudia Aradau, Susanne Krasmann, Rens van Munster, Sven Opitz, and Wouter Werner for comments on an earlier version of this paper. Thanks to Gavin Sullivan and Liesbeth van der Heide for research assistance.