The administration of criminal justice frequently requires courts to evaluate different forms of evidence which may not always point uniformly towards the same conclusion. In a murder trial, one of the most significant questions arises when the testimony of an eyewitness appears to conflict with medical, scientific or forensic evidence. The issue then is whether direct ocular evidence should prevail or whether the scientific findings should be treated as more reliable. Indian criminal jurisprudence does not prescribe an inflexible rule that one category of evidence must invariably prevail over the other. Nevertheless, the Supreme Court of India has consistently recognised that credible, trustworthy and reliable ocular testimony ordinarily carries substantial evidentiary value and cannot be discarded merely because of minor inconsistencies with medical or forensic opinion.
Ocular evidence essentially consists of the testimony of a person who claims to have directly witnessed the commission of an offence. In a murder case, such evidence assumes considerable importance because an eyewitness provides a direct account of the occurrence, including the identity of the accused, the nature of the assault, the weapon allegedly used and the circumstances surrounding the incident. Medical and forensic evidence, on the other hand, generally assists the Court in scientifically examining whether the injuries, weapon, cause of death and other physical circumstances are consistent with the prosecution version. Forensic evidence may include post-mortem findings, ballistic examination, DNA analysis, fingerprints, bloodstain analysis, toxicological examination and other scientific material. While these forms of evidence are undoubtedly important, their evidentiary purpose is ordinarily to assist the Court in evaluating the truthfulness and probability of the substantive evidence placed before it.
The Supreme Court has explained this relationship in Darbara Singh v. State of Punjab, (2012) 10 SCC 476. The Court recognised that oral evidence ordinarily enjoys primacy unless it becomes totally irreconcilable with the medical evidence. This principle is particularly important because medical evidence generally represents expert opinion regarding the nature and possible manner of injuries, whereas a trustworthy eyewitness gives a direct account of what he or she actually witnessed. Therefore, every variation between an eyewitness account and a medical opinion cannot automatically result in the rejection of the prosecution's case. The contradiction must be of such a fundamental character that the medical evidence completely rules out the possibility of the occurrence having taken place in the manner described by the eyewitness. Thus, the judicial inquiry is not merely whether some discrepancy exists, but whether the discrepancy destroys the very foundation of the ocular version.
The principle received detailed consideration in Abdul Sayeed v. State of Madhya Pradesh, (2010) 10 SCC 259. The Supreme Court reiterated that ocular testimony ordinarily has greater evidentiary value than medical evidence, although medical evidence assumes decisive importance where it renders the eyewitness version impossible or completely improbable. The judgment is especially significant in relation to the evidence of an injured eyewitness. An injured witness occupies a distinct position in criminal jurisprudence because the injuries suffered by such a witness provide an inherent assurance of his or her presence at the scene of occurrence. Ordinarily, a person who has himself suffered injuries during the incident would have little reason to falsely implicate another person while allowing the actual offender to escape. This does not mean that the testimony of every person claiming to be an eyewitness must be mechanically accepted. The Court remains under an obligation to carefully scrutinise the testimony and determine whether the witness was actually present at the scene, whether the witness had sufficient opportunity to observe the occurrence, whether the identification of the accused is trustworthy and whether the account remains consistent on material particulars. Improvements, material omissions, serious contradictions, unnatural conduct or circumstances suggesting that the witness is planted or interested may affect the evidentiary value of such testimony. Therefore, the doctrine of primacy of ocular evidence protects credible eyewitness testimony; it does not create an irrebuttable presumption that every eyewitness account is necessarily true.
A similar approach was adopted by the Supreme Court in Kamaljit Singh v. State of Punjab, (2003) 12 SCC 155. The Court reiterated that minor variations between medical evidence and ocular testimony are not sufficient by themselves to destroy the credibility of an eyewitness. Human observation and recollection cannot be expected to possess mathematical precision. An eyewitness witnessing a sudden and violent incident may not accurately describe the precise angle of an assault, exact dimensions of a weapon, depth of an injury or every movement of the accused. Such matters are subsequently examined scientifically by medical or forensic experts. Therefore, an ordinary inconsistency between the witness's description and the expert's findings does not necessarily establish falsity. What becomes legally significant is a contradiction of such magnitude that the injuries could not possibly have been caused in the manner alleged by the eyewitness.
The distinction between an inconsistency and an impossibility is, therefore, crucial. Suppose an eyewitness states that an accused assaulted the deceased with a particular weapon, while the medical evidence indicates that the injuries could possibly have been caused by such a weapon, though another weapon might also produce similar injuries. Such medical opinion does not necessarily contradict the eyewitness. Conversely, if reliable scientific evidence conclusively demonstrates that the injury could not have been caused in the manner narrated, the Court must examine the ocular account with considerably greater caution. The decisive consideration is whether the scientific evidence merely presents another possible explanation or completely excludes the possibility of the eyewitness version. It is principally in the latter situation that medical or forensic evidence may substantially undermine otherwise direct testimony
Forensic science has undoubtedly acquired increasing importance in modern criminal trials. DNA profiling, ballistic examination, electronic evidence and sophisticated crime scene analysis can provide objective assistance to courts. However, scientific evidence must itself be proved in accordance with law and evaluated in the factual context of each case. The description of evidence as “scientific” does not automatically make it infallible, just as the description of a person as an “eyewitness” does not automatically make the testimony truthful. The judicial function requires the Court to assess the entire evidentiary record harmoniously instead of assigning mechanical superiority to a particular label of evidence. Courts ordinarily endeavour to read ocular, medical and forensic evidence together and determine whether they can reasonably coexist. Minor inconsistencies that do not affect the core of the prosecution's case should not be elevated into fundamental contradictions. At the same time, a serious scientific contradiction that strikes at the very possibility of the prosecution narrative cannot be ignored merely because an eyewitness has supported that narrative.
The practical significance of these principles arose when the above precedents were relied upon in a murder case before the High Court of Karnataka in Crl.P. No. 12762/2026.
The Bench presided over by Justice M Nagaprasanna granted liberty to the petitioner to approach the trial court for enlargement on bail, thereby enabling the petitioner to seek appropriate relief before the jurisdictional Court in accordance with law.
The proceedings illustrate the practical importance of carefully examining the relationship between ocular and forensic evidence rather than treating either category in isolation.
About the author: Galav Gowda is an Advocate practicing before the Supreme Court of India and the High Court of Karnataka.
Disclaimer: The opinions expressed in this article are those of the author(s). The opinions presented do not necessarily reflect the views of Bar & Bench.
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