An accused can challenge the mental fitness of the complainant as a witness, since Section 118 of the Indian Evidence Act (now Section 124 of the Bharatiya Sakshya Adhiniyam) requires a witness to be capable of understanding questions and giving rational answers. Whether an accused can challenge the mental fitness of the complainant as a witness is assessed by the court itself, often through a preliminary examination (voir dire) or medical evaluation, rather than being decided solely on the accused's assertion, since courts are cautious about such challenges being used to discredit genuine victims. This judicial gatekeeping exists precisely because raising doubts about a witness's mental fitness carries significant weight and potential for misuse, so courts insist on genuine, objective assessment rather than accepting the accused's characterisation at face value.

The preliminary examination typically involves the court itself observing the witness's ability to understand and respond to basic questions before their substantive testimony begins, and only where genuine doubt arises from this observation, or from credible medical evidence already on record, does the court order a more formal psychiatric evaluation. This layered approach protects both the fairness of the trial and the dignity of the witness, ensuring the process is not weaponised to intimidate or discredit someone without proper basis.

This is a technical and sensitive challenge requiring careful, respectful handling, and courts scrutinise the basis for such claims closely, since raising this issue without genuine, credible grounds can backfire, both by failing before the court and by potentially being viewed as an attempt to distress or discredit a genuine victim unfairly. Any such challenge needs to be built on specific, documented indicators of impaired capacity rather than a general strategy to undermine the complainant's credibility.

For advice on whether this challenge is appropriate and how to raise it properly in your case, Aapka Legal Advice can provide a careful case assessment, weighing whether genuine grounds exist and how such a sensitive challenge should be framed if pursued. Our network of Top Criminal Lawyers in India and retired judges panel understand exactly how courts approach such delicate evidentiary questions, ensuring this ground is pursued only where genuinely warranted and handled with the sensitivity it demands. In conclusion, this remains a legitimate but carefully guarded challenge, requiring solid evidentiary grounding and thoughtful, respectful presentation before the court.