Expert report evidence in narcotics cases must disclose scientific basis; a bare conclusory opinion cannot sustain conviction.

A Public Analyst's report in a narcotics prosecution is not reliable enough for conviction if it gives only a bare conclusion that the sample was charas without disclosing the scientific tests, experiments, or underlying data. Expert opinion is admissible, but the court must be able to assess its probative value from the disclosed scientific basis. A conclusory report unsupported by method or material cannot, by itself, prove the prosecution case in a criminal trial carrying severe punishment. The conviction was therefore found unsafe and could not be sustained.

---

---

Issues: Whether a Public Analyst's report stating only a bare opinion, without disclosing the scientific tests or experiments performed, can be treated as reliable evidence to sustain conviction under the narcotic law.

Analysis: The report in question merely recorded the conclusion that the sample was charas, but did not set out the factual data, tests, or experimental basis on which that opinion was formed. Expert opinion is admissible, but it remains only a piece of evidence and the Court must be able to test its reliability on the basis of disclosed scientific material. A bald opinion unsupported by the underlying method or data does not furnish probative evidentiary value sufficient for a criminal conviction, particularly in a case carrying severe punishment.

Conclusion: The report was held to be inadequate and unsafe to rely upon, and the conviction could not be sustained; the finding was in favour of the appellant.

Ratio Decidendi: In a criminal trial, an expert's report can support conviction only if it discloses the scientific basis of the opinion and enables the Court to independently assess its reliability; a bare conclusory report without such material cannot, by itself, prove the prosecution case.

---