The doctrine of necessity is the basis on which extraordinary actions by administrative authority, which are designed to restore order or uphold fundamental constitutional principles, are considered to be lawful even if such an action contravenes established constitution, laws, norms, or conventions. The maxim on which the doctrine is based originated in the writings of the medieval jurist Henry de Bracton, and similar justifications for this kind of extra-legal action have been advanced by more recent legal authorities, including William Blackstone.[citation needed]
In a controversial 1954 judgment, Pakistani Chief Justice Muhammad Munir validated the extra-constitutional use of emergency powers by Governor General, Ghulam Mohammad.[1] In his judgment, the Chief Justice cited Bracton's maxim, 'that which is otherwise not lawful is made lawful by necessity', thereby providing the label that would come to be attached to the judgment and the doctrine that it was establishing.
The doctrine of necessity may also refer to the necessity of a judge with a reasonable apprehension of bias continuing to decide a matter if there is no alternative to that judge. The Supreme Court of Canada applied this doctrine in the 1998 Reference re Remuneration of Judges (No 2) case.
... Dismissing Mirza, army chief General Mohammad Ayub Khan took over first as chief martial law administrator ... a compliant judiciary upheld the imposition of martial law under the doctrine of necessity ...