Using the example of anti-terrorism measures, this chapter looks at the difficulties experienced by the Court of Justice of the EU (CJEU) in reconciling the conflicting demands of fundamental rights protection and public security. It shows that under the current arrangements, the CJEU cannot have regard to information which has not gone through a proper adversarial hearing, even in cases where disclosure of the relevant information will jeopardise the public interest. The chapter thus envisages the possibility for reform. It examines, in particular, the special advocate procedure and the sort of difficulties that its transposition in the EU context would give rise to.