What the rule of law means and how it constrains the exercise of state power raise issues which have been debated-without resolution-over the ages. Times of emergency bring fresh energy to the discussion, and David Dyzenhaus is one of many who have entered the fray to debate the balance between liberty and national security in the post 9/11 period. It has not been easy for those who place their trust in written constitutions to account for the way textual guarantees are diluted when the state is under threat. Rather than address that dilemma, Dyzenhaus sets his ideas apart by proposing a theory which maximizes the protection of rights in emergency circumstances, without straining the institutional capacities or legitimacy of the judiciary. This theory invokes the pedigree of the common law-and “common law constitutionalism”-and is grounded in the constitutive properties of the rule of law, or principle of legality. Dyzenhaus may not have answered the questions readers will want to ask, but he has opened up the middle ground between the competing supremacies yet more, by drawing common law constitutionalism and its rule-of-law pedigree into constitutional theories of review. More to the point, he has challenged the judiciary to draw on the moral resources of the law to make executive and legislative action as accountable as possible at all times, in emergencies as well as in normal times. Readers can and should engage, at many levels, with the complexity of his thought in this important book.
