Section 45 Bharatiya Sakshya Adhiniyam, 2023: Grounds of opinion, when relevant

Section 45 of Bharatiya Sakshya Adhiniyam, 2023: Grounds of opinion, when relevant

Official Bare Act Text

Override / Mandate Mens Rea (Intent) Actus Reus (Conduct) Punishment Limitation Monetary

Whenever the opinion of any living person is relevant, the grounds on which such opinion is based are also relevant.

Illustrations

An expert may give an account of experiments performed by him for the purpose of forming his opinion.

Statutory Defined Terms in this Section: (Click any term for official legal definition)

Court Sec 2(1)(a) Fact Sec 2(1)(d)

Legal Commentary & Landmark Judgments: Section 45

Section 45 declares that whenever the opinion of any living person is relevant, the grounds on which such opinion is based are also relevant, enabling judicial testing of expert and lay hypotheses.

Foundation of Opinion: The reasoning, clinical observation, laboratory tests, or mercantile documents forming the basis of the opinion must be disclosed.
Testing Scientific Validity: Enables the court to evaluate whether the conclusion logically flows from verified premises.
Accountability Mechanism: Deprives ipse dixit assertions of evidentiary weight if the witness fails to disclose their underlying analytical methodology.

Key Landmark Precedents:

State of H.P. v. Jai Lal (1999) 7 SCC 280: The Supreme Court stressed that the grounds of opinion under Section 51 IEA (Section 45 BSA) are critical; an expert must place before the court the scientific data to enable independent judicial evaluation.
Ramesh Chandra Agrawal v. Regency Hospital Ltd. (2009) 9 SCC 709: Held that an expert opinion without grounds or supporting scientific literature cannot assist the court and must be rejected.

Courtroom Practice & Strategic Litigation Guidance:

Cross-examining an expert begins with Section 45: compel the expert to produce raw bench notes, calibration records of medical scanners, and control sample logs. If grounds are absent or unscientific, the opinion collapses.