Evaluating Witness Competency: Standards and Exceptions in Evidence Law

In a courtroom, the entire pursuit of justice rests on one critical foundation – the testimony of witnesses. But not everyone who walks into a court can simply take the stand and speak. The law carefully filters who is allowed to testify, under what conditions, and whether they can even be compelled to do so. These questions sit at the heart of witness competency – a concept that determines who counts as a valid voice in the eyes of the law. Understanding this is not just an academic exercise; it shapes the outcome of trials, protects individual rights, and upholds the integrity of the justice system.

What does “competency of a witness” mean? 🔗

In evidence law, competency refers to the legal qualification or capacity of a person to testify before a court. As Drishti Judiciary puts it, competency is the rule and incompetency is the exception. The law does not require a witness to be educated, socially respected, or of any particular age or religion. The singular test is cognitive – can the person understand the questions put to them, and can they give rational answers?

Historically, this was governed by Section 118 of the Indian Evidence Act, 1872 (IEA). Now, with the enactment of the Bharatiya Sakshya Adhiniyam, 2023 (BSA) – which replaced the IEA – the same principle is carried forward under Section 124 of the BSA. Fox Mandal’s analysis of the BSA notes that the new law replaces the outdated term “lunatic” used in the IEA’s explanation with the more respectful and legally precise phrase “person with mental illness,” as defined under the Mental Healthcare Act, 2017. This is not just a cosmetic change – it signals a broader commitment to an inclusive and rights-respecting legal framework.

The general rule: everyone is competent 🔗

Under Indian evidence law, every person is presumed competent to testify. Religion, caste, gender, and age have no bearing on this determination. The court only looks at one thing: whether the person before it can understand what is being asked and respond with reason. This inclusive approach ensures that the law does not exclude voices arbitrarily.

Section 124 of the BSA states that all persons are competent to testify unless the court finds they are prevented – by tender years, extreme old age, bodily or mental disease, or any similar cause – from understanding the questions or giving rational answers. The emphasis is on functional capacity, not social status or identity.

When does incompetency arise? 🔗

Incompetency is not presumed – it must be determined by the court on the facts of the case. The BSA identifies the following as possible grounds that may lead to incompetency:

Tender years (child witnesses) 🔗

A child is not automatically disqualified from testifying. Courts assess whether the child can understand the questions and respond sensibly. To make this determination, courts conduct what is known as the voir dire test – a preliminary questioning of the child witness outside the scope of the case, covering basic matters like their name or address. As iPleaders notes, if the court is satisfied that the child can understand and respond rationally, the child may be allowed to testify. However, as a matter of caution, courts generally require corroboration before convicting based solely on a child’s testimony. The Supreme Court, in Dattu Ramrao Sakhare v. State of Maharashtra (AIR 1997 SC 2494), held that a child’s testimony must be evaluated carefully – but if it is found credible, it can form the basis of a conviction.

It is also relevant to note the intersection with the Bharatiya Sakshya Adhiniyam, 2023 framework and legislation like the POCSO Act, 2012, which provides special safeguards for child witnesses in sexual offence cases, recognising the unique vulnerabilities such witnesses face.

Extreme old age 🔗

Old age by itself does not render a person incompetent. The question remains the same – is the person capable of understanding the questions and answering rationally? The court must make this assessment on a case-by-case basis. A frail but mentally alert elderly person remains a fully competent witness.

Mental illness 🔗

This is one of the most nuanced grounds for assessing competency. A person with mental illness is not automatically excluded from testifying. The law under Section 124 of the BSA (and previously under Section 118 of the IEA) makes it clear that a person suffering from mental illness is competent to testify unless that illness specifically prevents them from understanding the questions or giving rational answers. A person may be mentally ill in some respects, yet perfectly coherent when it comes to recounting the events in question. Courts must evaluate the actual cognitive functioning of the witness at the time of testimony.

Physical conditions and communication challenges 🔗

What about a person who cannot speak? Section 125 of the BSA (previously Section 119 of the IEA) provides that a witness who is unable to communicate verbally may give evidence through writing, signs, or any other intelligible means. Evidence given in this way is treated as oral evidence. iPleaders highlights the Delhi High Court’s position in Chander Singh v. State, where it was observed that a deaf and mute witness may have a limited vocabulary and face difficulty in cross-examination, but these limitations do not affect their competency or credibility. A lack of spoken language is not a lack of truth.

Compellability: competent but can you be forced? 🔗

Competency and compellability are distinct concepts. A person may be competent to testify but cannot always be compelled to do so. The law recognises certain protected relationships and situations where a witness – though fully capable of testifying – is shielded from being forced to reveal what they know. These are called privileged communications, and they are enshrined in Sections 121-134 of the BSA (corresponding to Sections 121-129 of the IEA).

Judges and magistrates (Section 127, BSA) 🔗

A judge or magistrate cannot be compelled to answer questions about their own conduct in court or about anything that came to their knowledge while acting in that capacity – unless a superior court specifically orders it. This protection exists to preserve judicial integrity. As the LawGist explains, removing this shield would expose courts to constant harassment through litigation against judges, undermining the stability of judicial proceedings.

Spousal privilege (Section 128, BSA) 🔗

A married person cannot be compelled to disclose any communication made by their spouse during the marriage, and cannot do so even voluntarily without the spouse’s consent. This privilege exists to protect the trust and privacy of the marital relationship. It is worth noting, however, that the privilege covers the communication – not the conduct. In MC Verghese v. TJ Ponnan (1970), the Supreme Court clarified that while a spouse may not testify about the content of a written communication, the same communication could still be proved through a third party who received it.

The exceptions to spousal privilege are important: the privilege does not apply when one spouse is being prosecuted for a crime committed against the other, or where the communicating spouse (or their representative) gives free consent to disclosure.

Importantly, Section 126 of the BSA (Section 120 of the IEA) separately addresses the competency of spouses as witnesses. In civil proceedings, both parties and their spouses are competent witnesses. In criminal proceedings, the spouse of the accused is a competent witness. The Calcutta High Court in Shyam Singh v. Shaiwalini Ghosh (AIR 1947) affirmed that husband and wife can testify against each other in both civil and criminal cases. The key distinction: Section 126 makes them competent; Section 128 limits what they can be compelled to disclose.

Affairs of state and official communications 🔗

Under Section 129 of the BSA, no one can give evidence derived from unpublished official records relating to state affairs without the permission of the head of the relevant department. Section 130 further ensures that public officers cannot be forced to disclose communications received in official confidence when they believe disclosure would harm public interest. These provisions balance the court’s need for information against the state’s interest in confidentiality.

Police and informant privilege (Section 131, BSA) 🔗

No magistrate or police officer can be compelled to disclose the source of information that led to the investigation of an offence. This protects informants – often the most vulnerable participants in criminal justice – from being exposed, which would otherwise dry up crucial intelligence channels.

Professional (attorney-client) privilege (Section 132, BSA) 🔗

One of the most well-known privileges in law, Section 132 of the BSA (previously Section 126 of the IEA) bars any advocate or legal professional from disclosing communications made by a client during the course of professional engagement – unless the client expressly consents. As Live Law explains, this privilege extends beyond just verbal communication to documents the advocate has become acquainted with through their employment. The rationale, articulated by the Supreme Court in Maneka Gandhi v. Rani Jethmalani, is that clients must feel safe enough to share the full truth with their lawyers to get meaningful legal assistance.

There are critical exceptions, however: the privilege does not protect communications made to further an illegal purpose, nor does it shield the advocate from disclosing facts they observed during their employment that show a crime or fraud was committed after the engagement began. Section 134 of the BSA extends similar protection to the client – no one can be forced to disclose confidential communications with their legal adviser, unless the client has offered themselves as a witness and the disclosure becomes necessary to explain the evidence they have given.

Accomplices as witnesses (Section 138, BSA) 🔗

A question often arises about the reliability of accomplice testimony. Can someone who participated in a crime testify against a co-accused? Section 138 of the BSA answers this clearly: an accomplice is a competent witness against an accused person. A conviction is not illegal simply because it rests on an accomplice’s testimony. However, courts apply the rule of prudence – it is unsafe to convict based solely on uncorroborated accomplice testimony, given the obvious motivations an accomplice may have to falsify or deflect blame.

Quality over quantity: the number of witnesses 🔗

A common misconception is that more witnesses automatically means a stronger case. Section 139 of the BSA makes clear that no particular number of witnesses is required to prove any fact. The Supreme Court reinforced this in Binay Kumar v. State of Bihar, holding that a conviction is determined not by the quantity of witnesses but by the quality and credibility of their testimony. One credible witness can outweigh ten unreliable ones.

The broader principle: reliability and rights together 🔗

The law of witness competency is ultimately built on two intersecting goals. The first is reliability – courts need testimony from people who can genuinely understand what happened and communicate it accurately. The second is the protection of individual rights – the law recognises that certain relationships and roles require confidentiality, and forcing disclosure in these contexts would cause greater harm than the evidence is worth. The Bharatiya Sakshya Adhiniyam, 2023, by updating language, broadening inclusion, and preserving these protections, reflects an evolving commitment to both goals.

What do you think? Should spousal privilege be absolute, or should courts have greater discretion to override it when one spouse is a critical witness to a serious crime? And given the BSA’s push towards inclusion, do you think current procedures for child and mute witnesses go far enough in making the courtroom truly accessible?

References

1. https://www.drishtijudiciary.com/to-the-point/bharatiya-sakshya-adhiniyam-&-indian-evidence-act/competency-of-a-witness
2. https://foxmandal.in/whats-new-in-indian-evidence-law-a-look-at-bsa-2023/
3. https://blog.ipleaders.in/witness-hunting-competency-reliability-protection-witnesses/
4. https://blog.ipleaders.in/witnesses-under-the-indian-evidence-act/
5. https://www.indiacode.nic.in/handle/123456789/20063
6. https://www.pahujalawacademy.com/section-124-who-may-testify
7. https://blog.ipleaders.in/witness-under-the-evidence-act-1872/
8. https://thelawgist.org/privileged-communication-section-121-129/
9. https://blog.ipleaders.in/privileged-communications-under-evidence-act-1872/
10. https://www.livelaw.in/law-firms/law-firm-articles-/legally-privileged-information-evidence-act-206767