Investigation irregularity without proven prejudice does not vitiate conviction under anti-corruption procedure safeguards.

Pre-permission verification by a police officer, including checking relevant records and ascertaining facts, constituted investigation under the Criminal Procedure Code, so the statutory safeguard requiring prior Magistrate permission under section 5A of the Prevention of Corruption Act, 1947 was initially breached. However, the irregularity in the early stage of investigation did not vitiate the conviction because the evidence was found trustworthy, a fair trial was held, and no prejudice to the accused was shown. The Supreme Court restored the conviction and sentence, setting aside the acquittal.

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Issues: (i) Whether the police officer's steps before obtaining the Magistrate's permission amounted to investigation within the meaning of the Code of Criminal Procedure and violated the statutory safeguard under section 5A of the Prevention of Corruption Act, 1947. (ii) Whether the irregularity, if any, in the initial stage of investigation vitiated the conviction in the absence of proof of prejudice to the accused.

Issue (i): Whether the police officer's steps before obtaining the Magistrate's permission amounted to investigation within the meaning of the Code of Criminal Procedure and violated the statutory safeguard under section 5A of the Prevention of Corruption Act, 1947.

Analysis: The information received was specific and detailed. The officer proceeded to verify the allegations by examining relevant railway records and ascertaining the facts, which fell within the statutory meaning of investigation under the Code. Section 5A required prior permission of a Magistrate for investigation by an officer below the prescribed rank, and that safeguard was not observed at the first stage.

Conclusion: The pre-permission steps constituted investigation, and section 5A was initially violated.

Issue (ii): Whether the irregularity, if any, in the initial stage of investigation vitiated the conviction in the absence of proof of prejudice to the accused.

Analysis: The governing principle was that an irregularity in investigation does not by itself invalidate a trial unless prejudice is shown. The evidence was accepted as trustworthy, the accused had a fair trial, and after permission was obtained there was a further investigation in substantial compliance with law. No nexus was established between the initial irregularity and any prejudice to the defence.

Conclusion: The conviction was not vitiated because no prejudice to the accused was shown.

Final Conclusion: The High Court's acquittal was set aside and the conviction and sentence recorded by the Special Judge were restored.

Ratio Decidendi: An irregularity in investigation does not vitiate a conviction unless it is shown to have caused prejudice to the accused in the trial.

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