Decoding the Insanity Defence

The insanity defence exempts the mentally ill from criminal liability when they cannot appreciate the nature or consequences of their acts. The underpinning of the insanity defence is found in landmark cases like the McNaughton's Case and the ALI Test, among others. It reflects the principle that there can be no guilt without a proper act and a culpable mental state. Its application in this area falls at the interface of many complex questions on burden of proof, malingering, and standards of proof which raises expectations on scientifically validated psychiatric evaluation and procedural clarity. This defence also demands rigors for safeguards against its misuse and fairness in its practice. In Nepal, though the insanity defence is an established defence, it nonetheless remains plagued by judicial inconsistency, especially with regard to burden of proof. While the burden of proving unsoundness of mind normally lies with the accused, courts have in some instances shifted the burden onto the prosecution which results in erratic jurisprudence and precedents. These gaps indicate a reform that needs to be done which includes setting up clear evidentiary standards, better access to forensic psychiatrists, and improving collaboration between the legal and mental health sectors. By attending to these issues, Nepal will have considerably enhanced the fairness and harmony of its insanity defence with international norms.