He stabbed twice. He admitted it. The Supreme Court acquitted him anyway.

Two Stabs, One Life, and a Case Diary That Didn't Add Up

On June 21, 1992, Gajendra Singh went for a picnic with friends Suresh and Sunil. On his way back, Shailesh Kumar intercepted him on a motorcycle and stabbed him twice — once in the chest, once in the stomach. The alleged motive: money owed for incomplete work. Gajendra died. Shailesh was convicted under Section 302 IPC and sentenced to life imprisonment. The trial court and the High Court both confirmed. Sixteen years later, the Supreme Court of India looked at the investigation record and asked a question that should have been asked long before: did the police follow the law when they wrote down what happened?

The Picnic That Ended in Blood

The prosecution's case was straightforward. Gajendra had gone out with friends. On return, Shailesh stopped him, pulled out a knife, and stabbed him. Friends rushed Gajendra to a hospital where a doctor gave first aid and referred him to Dehradun. Gajendra's father filed a complaint. The accused was arrested near the scene. A knife was recovered. The trial court — the Addl. Sessions Judge/Special Judge, Anti-Corruption U.P (East), Dehradun — convicted Shailesh relying on the testimony of PW-1 (the father/complainant), PW-2 and PW-3 (the eyewitnesses), PW-5 (the first treating doctor), and the recovery of the weapon. The court brushed aside discrepancies as minor. The Division Bench of the High Court of Uttarakhand at Nainital concurred, relying on the post-mortem report and the same witnesses.

But Shailesh's appeal to the Supreme Court in Criminal Appeal No. 684 of 2012 raised a different kind of challenge. Not about the stabbing. About the investigation itself.

What the Case Diary Didn't Say

The defence pointed to serious lapses. No timely FIR. A tampered general diary. Contradictory witness testimony. Key witnesses unexamined. The Supreme Court, in a judgment authored by Justice M.M. Sundresh, did not just look at the evidence. It looked at the process. And what it found was a pattern of procedural failure that went to the root of the prosecution's case.

The Court began by examining the duty of the Investigating Officer (IO). It cited Arvind Kumar @ Nemichand & Ors. v. State of Rajasthan, (2021) 11 SCR 237, which held that an IO must investigate fairly. A defective investigation per se does not benefit the accused unless it is fundamental. But suppression of facts makes the investigation colourable — and that undermines the entire prosecution case. The Court quoted Kumar v. State, (2018) 7 SCC 536, within that precedent: criminal justice must be above reproach; police suppression of facts cannot be ignored regardless of persuasive evidence.

Then came the obiter that will be cited in every criminal appeal from now on: "The IO does not know sides — neither of the victim nor the accused — and shall be guided only by law and be an epitome of fairness." And another: "A pliable change is required in the mind of the IO; the IO must first satisfy whether a case falls under culpable homicide not amounting to murder before charging murder."

The Case Diary: A Mandatory Record, Not an Optional One

The core of the judgment is about Section 172 CrPC — the diary of proceedings in investigation. The Court reproduced the exact text: "Every police officer making an investigation under this Chapter shall day by day enter his proceedings..." The word "shall" was not accidental. The Court held that an IO has a mandatory duty to record day-to-day proceedings with date, time, place, and statements under Section 161 CrPC in the case diary. Improper maintenance is a serious lapse that diminishes investigation credibility, though the accused must show prejudice.

The Court cited Common Cause & Ors. v. Union of India, (2015) 6 SCC 332, which held that a high degree of responsibility rests on the investigating agency to ensure that an innocent person is not subjected to a criminal trial. Ethical rectitude is required. Then it turned to Bhagwant Singh v. Commissioner of Police, which laid down the standard: case diary entries must be made with promptness, sufficient detail, chronological order, and complete objectivity.

But the Court did not stop at stating the law. It went further. It cited Baleshwar Mandal v. State of Bihar, which held that failure to comply with Section 172 CrPC is a serious lapse, but the accused must show prejudice. Then it cited Manoj & Ors. v. State of Madhya Pradesh, which reinforced that failure to maintain the police diary accurately undermines the accused's right to a fair investigation, and the trial court must actively scrutinise the record.

The Witness Rule the Supreme Court Applied

The judgment then addressed a technical but critical point: the interplay between Section 172(3) CrPC and Sections 145 and 161 of the Evidence Act. Section 145 allows cross-examination on previous statements in writing. Section 161 gives the adverse party the right to produce any writing used to refresh memory. Section 172(3) CrPC restricts the accused's right to use the case diary — it can only be used when the police officer uses it to refresh memory or when the court uses it for contradiction.

The Court cited Balakram v. State of Uttarakhand & Ors., which clarified that the accused's restricted right to cross-examine on the case diary is limited to those two situations. But the Court held that these provisions must be read in consonance. The accused's right cannot be denied when the author uses the diary to refresh memory or the court uses it for contradiction. This is not a theoretical point. In this case, the prosecution relied on the case diary to prove the sequence of events. The defence was entitled to test that sequence.

FIR Before General Diary: The Sequence That Matters

The judgment also addressed the relationship between the FIR and the general diary. Under Section 154 CrPC, an FIR on information of a cognizable offence must be registered first in the book kept by the officer in charge. A general diary entry cannot precede the registration of the FIR except where a preliminary inquiry is needed. The Court cited Lalita Kumari v. Government of Uttar Pradesh & Ors., which established that principle. The Court also referred to Section 44 of the Police Act, 1861, which governs the general diary.

In this case, the defence alleged that the general diary was tampered with and that the FIR was ante-dated. The Court did not accept or reject that allegation on the truncated record. But it laid down the law with unmistakable clarity: the sequence matters. If the general diary entry comes before the FIR, the investigation is suspect from the start.

THE PLAY: In every criminal appeal where the investigation is challenged, the defence must demand the original case diary and the general diary. If the entries are not chronological, if the FIR is not the first document, the prosecution's case is colourable — and the accused is entitled to acquittal.

Why This Matters in Practice

For advocates, this judgment is a toolkit. The ratio is clear: a defective investigation per se does not benefit the accused unless it is fundamental. But suppression of facts makes the investigation colourable. The distinction between "defective" and "colourable" is now sharper. If the IO failed to record statements, tampered with the diary, or ante-dated the FIR, the investigation is not just defective — it is colourable. The prosecution cannot rely on it.

For CFOs and founders, the lesson is different but equally important. The judgment is about process integrity. The Supreme Court is saying: the process matters as much as the outcome. If the police cut corners, the conviction falls. The same principle applies in corporate investigations, regulatory compliance, and internal audits. If the process is compromised, the result is unreliable.

The Court also made an obiter observation that will be cited in every murder trial: the IO must first satisfy whether a case falls under culpable homicide not amounting to murder before charging murder. That is a direct challenge to overcharging under Section 302 IPC. It is a reminder that the charge must fit the facts, not the other way around.

The Bottom Line

This judgment does not say that Shailesh is innocent. It says that the investigation was so compromised that the conviction cannot stand. The Supreme Court has sent a message to every trial court and every High Court: scrutinise the investigation record. Demand the case diary. Check the general diary. If the police did not follow the law, the accused gets the benefit — not because he is innocent, but because the process was unfair.

For the practitioner: the next time you argue a criminal appeal, ask for the case diary. If it is not maintained properly, cite Shailesh Kumar v. State of U.P., 2024 INSC 143. The law is now on your side.