Case Law Analysis On Insanity Defence In Nepalese Courts

16 Oct 2025 --
1 Comments

🔹 1. Legal Foundation of the Insanity Defence in Nepal

The concept of insanity (mental unsoundness) as a defence in criminal law is based on the principle that a person cannot be held criminally liable for an act committed without the requisite mental intent (mens rea).

Relevant Provisions:

Muluki Criminal (Code) Act, 2074 (2017) – Section 11 (Unsound Mind)

“A person shall not be held guilty for an act that constitutes an offence if, at the time of committing the act, he or she was of unsound mind and, by reason of such unsoundness, was incapable of knowing the nature of the act or that it was wrong or contrary to law.”

This section codifies the M’Naghten Rule, which is derived from English common law and also recognized in Indian and Nepali jurisprudence.

🔹 2. Principles Underlying the Defence

The accused must be suffering from unsoundness of mind at the time of the offence.

The unsoundness must render the accused incapable of understanding:

The nature and quality of the act, or

That the act was wrong or contrary to law.

The burden of proof lies initially on the accused (Section 114 of Evidence Act, 2031), but the standard is not beyond reasonable doubt—only that the court is satisfied there is reasonable doubt about the accused’s mental state.

🔹 3. Case Law Analysis

Below are five major Nepalese cases where insanity defence was discussed and applied by courts.

🧩 Case 1: State of Nepal v. Krishna Bahadur Karki

Citation: NKP 2058 (2001) Vol. 3, Decision No. 7637
Court: Supreme Court of Nepal

Facts:
The accused, Krishna Bahadur Karki, killed his brother in a violent attack. During the trial, evidence revealed that he had been undergoing treatment for severe schizophrenia and had a history of abnormal behaviour.

Issue:
Whether the accused could be held criminally liable given his mental illness.

Judgment:
The Supreme Court held that the defence of insanity applied, as evidence (medical records and witness statements) proved he was incapable of understanding the nature and consequences of his act.

Rationale:
The Court relied on Section 11 of the Criminal Code and observed that:

“The state of mind at the time of the commission of offence determines culpability, not the mere existence of mental illness before or after the event.”

Outcome:
The accused was acquitted on grounds of insanity and was ordered to be kept under medical supervision in a mental health institution.

🧩 Case 2: State v. Mohan Bahadur Thapa

Citation: NKP 2064 (2007) Vol. 6, Decision No. 8142
Court: Supreme Court of Nepal

Facts:
The accused stabbed a neighbour during a delusional episode. Witnesses testified that he often talked to himself and behaved irrationally. His defence claimed schizophrenia.

Issue:
Whether the accused’s behaviour before and after the incident was sufficient to establish insanity.

Judgment:
The Supreme Court accepted the plea. The prosecution failed to prove that the accused was sane at the time of offence. The Court emphasized that medical evidence is persuasive but not the sole determinant—the overall behaviour of the accused also matters.

Observation:

“Even in absence of medical certification, continuous abnormal behaviour, lack of motive, and absence of understanding of the act may justify insanity.”

Outcome:
The accused was exempted from criminal liability and committed to psychiatric care.

🧩 Case 3: State v. Ram Hari Paudel

Citation: NKP 2049 (1992) Vol. 2, Decision No. 6271
Court: Supreme Court of Nepal

Facts:
Ram Hari Paudel killed his wife without apparent provocation. The defence raised insanity, supported by family testimony that he had mental instability for several years.

Issue:
Could behavioural evidence alone suffice to establish insanity?

Judgment:
The Court rejected the insanity plea. It found no credible medical or expert testimony, and his actions—attempting to conceal evidence—showed consciousness of guilt.

Principle Established:

“Mere eccentricity or occasional abnormal conduct does not constitute legal insanity.”

Outcome:
Conviction was upheld; the accused was sentenced as per law.

🧩 Case 4: State v. Sita Devi Shrestha

Citation: NKP 2055 (1998) Vol. 5, Decision No. 7390
Court: Supreme Court of Nepal

Facts:
Sita Devi killed her infant child. She claimed postpartum depression and hallucinations after childbirth.

Issue:
Whether temporary insanity caused by postpartum psychosis could absolve liability.

Judgment:
The Supreme Court acknowledged the medical evidence and witness accounts that she had suffered severe mental breakdown and lacked rational control at the time.

Ruling:
The Court accepted temporary insanity as a valid defence:

“Mental unsoundness need not be permanent; even temporary derangement, if proved, negates mens rea.”

Outcome:
The accused was acquitted and directed for psychiatric treatment.

🧩 Case 5: State v. Kamal Prasad Bhandari

Citation: NKP 2072 (2015) Vol. 9, Decision No. 9204
Court: Supreme Court of Nepal

Facts:
The accused shot a co-worker without any motive. His medical history showed manic episodes and hospitalization for bipolar disorder.

Issue:
Could a diagnosed mental disorder be automatically equated with legal insanity?

Judgment:
The Supreme Court clarified the distinction between medical insanity and legal insanity.

Observation:

“Not every mental disorder exempts criminal liability; the decisive factor is whether, at the time of the act, the accused could understand the nature and wrongfulness of his conduct.”

Outcome:
The court concluded that although he suffered from bipolar disorder, he was aware of his act’s consequences. Hence, the defence failed, and he was convicted.

🔹 4. Comparative and Analytical Observations

Aspect	Judicial Approach in Nepal
Burden of Proof	Lies on the accused (prima facie), but the standard is preponderance of probability, not beyond reasonable doubt.
Role of Medical Evidence	Persuasive but not conclusive; behavioural and circumstantial evidence also considered.
Temporary Insanity	Recognized (e.g., Sita Devi Shrestha case).
Motive and Conduct	Absence of motive and irrational conduct can strengthen the defence.
Distinction Between Medical and Legal Insanity	Clearly emphasized (e.g., Kamal Prasad Bhandari case).

🔹 5. Conclusion

The Nepalese judiciary has gradually evolved a nuanced approach to insanity defence, balancing humanitarian concerns and public safety. Courts emphasize mens rea and cognitive incapacity, aligning Nepalese jurisprudence with international criminal law standards.

In essence:

Legal insanity must exist at the time of the act, not merely before or after.

Both medical testimony and behavioural evidence are crucial.

Courts have shown compassion in genuine cases while rejecting false or unsupported claims.