Insanity Defence in Contemporary Criminal Law: A Critical Analysis of Its Application and Misapplication

Abstract

The insanity defence represents one of the most debated doctrines in criminal law, reflecting the principle that criminal liability should not be imposed on individuals who, because of a severe mental disorder, lack the capacity to understand the nature or wrongfulness of their conduct. Despite its long-standing recognition, the defence continues to attract criticism for its perceived susceptibility to misuse and its potential impact on public confidence in the administration of justice. This article critically examines the application and alleged misapplication of the insanity defence through a doctrinal and comparative legal analysis of selected common law jurisdictions, with particular emphasis on Pakistan. It evaluates the legal standards governing the defence, the role of judicial interpretation, and the procedural safeguards designed to distinguish genuine claims of insanity from unfounded assertions. The article argues that concerns regarding widespread abuse of the insanity defence are often overstated and that the more significant challenges arise from inconsistent judicial approaches, limited access to forensic psychiatric expertise, and outdated legislative frameworks. By comparing Pakistan's legal position with developments in England and Wales, the United States, Canada, and Australia, the study identifies areas requiring reform to improve consistency, fairness, and legal certainty. It concludes that a balanced judicial approach, supported by clearer statutory guidance, a bio-legal framework, robust evidentiary standards, strengthened forensic mental health procedures and well-informed judges, is essential to preserve both the rights of mentally ill defendants and public confidence in the criminal justice system.