This article addresses the conditions of possibility for the precautionary turn in legal discourse. Although the precautionary turn itself has been well-detailed in both legal and political discourse, insufficient attention has been paid to what made this shift possible. This article remedies this, starting by showing how the events of 9/11 were unable to be incorporated within current discursive structures. As a result, these discursive structures were dislocated and a new ‘crisis discourse’ emerged that succeeded in attributing meaning to the events of 9/11. By focusing on three important cases from three different jurisdictions evidencing the precautionary turn in legal discourse, this article shows that crisis discourse is indeed employed by the judiciary and that its logic made this precautionary approach to counterterrorism in the law possible. These events, now some 16 years ago, hold relevance for today’s continuing presence of crisis and crisis discourse.