NDPS ACT | FSL REPORT | CHEMICAL ANALYSIS | SECTION 52A | SAMPLING | CHAIN OF CUSTODY | PATNA HIGH COURT

Police Seized 'Narcotics' but There Is No Reliable FSL Report - Can the Substance Legally Be Treated as a Narcotic Drug?

By Advocate Ankit Kumar Singh

Legally reviewed and updated: 7 September 2026

Supreme Court of India | Patna High Court | Allahabad High Court at Prayagraj | Jharkhand High Court at Ranchi | Calcutta High Court | Delhi High Court and Delhi Courts/Tribunals | Matters concerning Bhopal, Madhya Pradesh | Multiple District Courts

Direct Answer

At the final proof stage, police cannot obtain an NDPS conviction merely by calling an unidentified material “ganja”, “heroin”, “charas”, “smack” or “narcotics”.

The prosecution must prove that the substance allegedly recovered actually falls within the prohibited drug, psychotropic-substance or other contraband category invoked under the Narcotic Drugs and Psychotropic Substances Act, 1985.

A reliable forensic or chemical examination report is ordinarily central to proving that scientific identity.

But the legal inquiry goes further.

A positive FSL report proves what was found in:

THE SAMPLE RECEIVED BY THE LABORATORY.

The prosecution must additionally prove:

THAT THIS WAS THE SAME SAMPLE RELIABLY DRAWN FROM THE MATERIAL ALLEGEDLY RECOVERED FROM THE ACCUSED.

Therefore, an NDPS case can fail because:

  • there is no FSL report at all;
  • the report was never properly brought on record;
  • the sample is not connected to the alleged recovery;
  • seals or packet numbers do not match;
  • the sampling procedure is unreliable;
  • malkhana custody is unexplained;
  • the report itself is negative; or
  • the report identifies something different from what police alleged.

Police Suspicion Is Not Final Scientific Proof

At the time of seizure, police or NCB officers may describe a substance according to:

  • appearance;
  • smell;
  • texture;
  • packaging;
  • field-testing kit;
  • experience of the officer.

Those factors may justify:

  • seizure;
  • arrest;
  • registration of an NDPS case;
  • further investigation;
  • sending samples for laboratory testing.

But a criminal conviction requires proof beyond reasonable doubt.

The question at trial is not merely:

“DID THE OFFICER BELIEVE IT WAS HEROIN?”

The question is:

“DID THE PROSECUTION LEGALLY PROVE THAT THE MATERIAL WAS HEROIN?”

Tilakhdhari Yadav: Patna High Court Asked How Ganja Could Be Declared Without FSL

In Tilakhdhari Yadav v. State of Bihar, Criminal Appeal (SJ) No.49 of 2011, decided on 26 March 2026, police claimed recovery of ganja from a hut.

However, Patna High Court found that:

  • the seized material had not been sent for chemical examination;
  • no FSL report proved it was ganja;
  • independent seizure witnesses did not support the prosecution;
  • the place and manner of recovery were doubtful; and
  • other statutory deficiencies existed.

The High Court questioned the very basis upon which the recovered material was treated as an NDPS narcotic substance without chemical examination.

The conviction was set aside.

Yogendra Sah: A Positive Narcotics Kit Was Still Not Enough

The 2026 Patna High Court decision in Yogendra Sah v. State of Bihar is even more directly relevant.

The prosecution alleged recovery of approximately 8.5 kilograms of ganja.

An officer had used a narcotics testing kit and treated the substance as ganja.

Yet at trial:

  • no reliable chemical examination report established the substance;
  • the seized ganja was not produced as a material exhibit;
  • the connection between alleged recovery and forensic sample was not reliably established;
  • independent witnesses did not support recovery.

Patna High Court set aside the conviction and acquitted the appellant.

The lesson is important:

FIELD TESTING IS INVESTIGATIVE EVIDENCE—IT DOES NOT AUTOMATICALLY BECOME CONCLUSIVE TRIAL PROOF.

Supreme Court: Nadeem Ahamed and the Positive Field-Test Problem

In Nadeem Ahamed v. State of West Bengal, 2025 INSC 993, police allegedly recovered brown powder from the appellant.

A field drug-testing kit returned a positive indication for heroin.

An FSL report later also reported heroin.

At first sight, that might appear to end the identity dispute.

It did not.

The Supreme Court examined the reliability of:

  • sampling;
  • packet identification;
  • Section 52A procedure;
  • seizure-to-laboratory chain.

The Court found the defects sufficiently serious that the FSL report could not safely be relied upon.

Once that scientific report lost its evidentiary foundation, there was no acceptable evidence proving that the article recovered from the appellant was heroin.

The conviction was set aside and the appellant was acquitted.

An FSL Report Answers Only Half the Question

A forensic laboratory ordinarily answers:

WHAT SUBSTANCE WAS PRESENT IN THE SAMPLE THAT ARRIVED AT THE LAB?

It does not independently know:

  • where police allegedly recovered the sample;
  • from whom it was recovered;
  • who drew it;
  • whether the packet was substituted;
  • whether the seal remained intact before dispatch;
  • whether it came from the mother packet alleged in the seizure memo.

Those links must be proved through the prosecution evidence.

The Complete NDPS Identity Chain

ALLEGED RECOVERY
       ↓
SEIZURE MEMO
       ↓
PACKET NUMBER
       ↓
WEIGHT
       ↓
SEALING
       ↓
SAMPLING
       ↓
SECTION 52A /
MAGISTRATE PROCESS
WHERE APPLICABLE
       ↓
MALKHANA
       ↓
DISPATCH MEMO
       ↓
CARRIER / TRANSFER
       ↓
FSL RECEIPT
       ↓
SEAL FOUND INTACT?
       ↓
CHEMICAL RESULT
       ↓
SAME SAMPLE
CONNECTED BACK
TO ACCUSED?

A defect at the final laboratory stage is serious.

But a defect anywhere in the connecting chain can also undermine the report.

Vijay Mukhiya: Positive FSL but Broken Evidentiary Chain

In Vijay Mukhiya v. State of Bihar, Criminal Appeal (DB) No.879 of 2019, decided on 15 January 2026, the prosecution had an FSL report concerning alleged charas.

Patna High Court nevertheless found serious problems including:

  • lack of reliable immediate sealing and labelling evidence;
  • absence of malkhana material proving safe custody;
  • defective sample procedure;
  • lack of reliable Magistrate-linked sampling evidence;
  • a substantial unexplained custody period before scientific examination.

The conviction was set aside.

Therefore:

POSITIVE CHEMICAL RESULT + UNPROVED SAMPLE IDENTITY = SERIOUS REASONABLE-DOUBT PROBLEM.

Dilip Kumar Sah: Courts Examine the Test Memo, Inventory and Sample History

In Dilip Kumar Sah & Others v. Union of India through DRI, Criminal Appeal (DB) No.1013 of 2024, decided on 2 April 2026, the prosecution relied upon a chemical examination report concerning alleged ganja.

Patna High Court examined substantial discrepancies concerning:

  • number of packets;
  • number of samples;
  • test memo;
  • sample preparation;
  • inventory;
  • custody of seized material;
  • belated certification;
  • proof of the chemical examination material;
  • Section 67 statements.

The Court granted benefit of doubt and set aside the convictions.

The case demonstrates why defence review should never stop at:

“FSL REPORT POSITIVE.”

What If the FSL Report Is Negative?

A negative chemical report can fundamentally change the case.

In Union of India through Narcotics Control Bureau v. Man Singh Verma, 2025 INSC 292, the alleged brown powder was suspected to be heroin.

The first laboratory sample tested negative for heroin and other narcotic substances.

A second set of samples was then tested at another forensic laboratory.

Those samples also tested negative.

The NCB ultimately filed a closure report and the accused was released.

The Supreme Court proceeding later concerned a different issue relating to compensation, but the factual history illustrates the danger of treating initial suspicion as final proof.

What If the Police Say “The Substance Smelled Like Ganja”?

Appearance and smell may provide initial investigative grounds.

But “ganja” is not merely a colloquial description.

It is a statutory category.

The NDPS Act defines ganja by reference to the flowering or fruiting tops of the cannabis plant and excludes seeds and leaves when not accompanied by the tops.

Therefore, in a contested prosecution:

GREEN LEAFY MATERIAL

does not automatically equal:

GANJA UNDER THE NDPS ACT.

Rohit Kumar: Was It Bhang or Ganja?

In Rohit Kumar v. State of Bihar, Criminal Miscellaneous No.86539 of 2025, Patna High Court recorded on 1 April 2026 that the forensic report was necessary to determine:

  • whether the seized article was bhang or ganja; and
  • whether the NDPS Act would be attracted.

The Court awaited the FSL report.

This illustrates that forensic identification can determine:

NOT JUST HOW STRONG THE NDPS CASE IS,

but:

WHETHER THERE IS AN NDPS CASE AT ALL.

Does Every Section 52A Defect Automatically Destroy the FSL Report?

No universal automatic rule should be stated.

A Court examines the complete prosecution evidence.

A minor procedural imperfection is not always equal to:

A BROKEN EVIDENTIARY IDENTITY.

But Section 52A defects become particularly serious where combined with:

  • samples drawn in an unreliable manner;
  • no Magistrate-linked certification where legally material;
  • different samples appearing at the laboratory;
  • unexplained packet substitutions;
  • missing seal evidence;
  • no malkhana chain;
  • no evidence connecting the FSL packet to the recovery.

In that situation, the question is no longer a mere technical irregularity.

It becomes:

“DID THE LABORATORY ACTUALLY TEST THE SUBSTANCE ALLEGEDLY RECOVERED FROM THIS ACCUSED?”

What Does “No Reliable FSL Report” Actually Mean?

Problem Legal Significance
No chemical examination ever conducted Identity of alleged narcotic may remain unproved at trial
Report pending during early investigation Investigation may continue; no automatic collapse of FIR
Report exists but sample chain is broken Positive result may not prove identity of material seized from accused
Field kit positive but no reliable final FSL Field result is not automatically conclusive trial proof
FSL report negative Can fundamentally undermine allegation that material is NDPS contraband
Packet number differs Creates identity/tampering concern
Seal not proved intact Chain-of-custody reliability becomes questionable
Sample drawn before Magistrate not sent to laboratory Prosecution may be relying on a different sample
Bulk contraband destroyed without reliable sample chain Can materially prejudice proof of identity
Report identifies a different drug Charged section/notification/quantity analysis may require reconsideration

Government FSL Reports and Section 329 BNSS

Under current criminal procedure, Section 329 BNSS permits reports of specified Government scientific experts to be used in evidence.

The listed categories include:

  • Chemical Examiners;
  • Assistant Chemical Examiners;
  • specified Central Forensic Science Laboratory officers;
  • specified State Forensic Science Laboratory officers;
  • other notified Government scientific experts.

The Court may summon an expert where it considers examination necessary.

Therefore:

“THE CHEMICAL EXAMINER DID NOT PERSONALLY COME TO COURT”

is not, by itself, a universal objection to every Government FSL report.

But Section 329 only addresses the evidentiary use of the expert report.

It does not prove:

  • the seizure;
  • the accused's possession;
  • safe custody;
  • sample identity;
  • absence of tampering.

Can a Positive FSL Report Alone Prove the NDPS Case?

No.

It may prove the chemical nature of the sample received.

The prosecution must still prove:

  • lawful and credible recovery;
  • possession or other relevant statutory conduct;
  • sample linkage;
  • chain of custody;
  • quantity;
  • accused-specific role;
  • other ingredients of the charged offence.

The Supreme Court's decision in Gorakh Nath Prasad v. State of Bihar is particularly important because even the FSL report did not cure failure to connect the forensic sample to reliably proved seized material.

Can a Field Test Ever Be Used?

Yes, for the limited purpose appropriate to the stage.

A drug-detection kit can assist officers in forming an initial view that the material may be:

  • heroin;
  • cocaine;
  • ganja;
  • amphetamine;
  • another controlled substance.

But such testing is preliminary.

It should not be treated as though a scientifically validated Government laboratory has conclusively established the precise scheduled substance for final conviction.

What If the FSL Report Arrives Late?

Delay alone is not automatically fatal.

The important questions include:

  • where the sample remained;
  • who had custody;
  • whether seals remained intact;
  • whether delay is explained;
  • whether sample number and weight remain consistent.

A delayed report can remain reliable where an intact documented chain is established.

But unexplained delay combined with:

  • no malkhana proof;
  • no seal evidence;
  • packet discrepancies;
  • sampling defects,

can seriously weaken the prosecution.

Why Substance Identity Also Matters to Quantity

NDPS punishment and bail can depend heavily upon whether the quantity is:

  • small;
  • greater than small but less than commercial; or
  • commercial.

But quantity thresholds differ by substance.

Therefore the legal sequence is: 

WHAT SUBSTANCE?
      ↓
WHICH SCHEDULE /
NOTIFICATION ENTRY?
      ↓
WHAT WEIGHT?
      ↓
SMALL /
INTERMEDIATE /
COMMERCIAL?

If the substance itself has not been reliably identified:

THE QUANTITY CLASSIFICATION CAN ALSO BECOME UNSAFE.

Section 37 Commercial-Quantity Bail and Missing FSL Evidence

Section 37 imposes stringent bail conditions in specified NDPS cases, including commercial-quantity prosecutions.

A missing or materially unreliable FSL chain can be relevant when the Court considers whether there are reasonable grounds for believing that the accused may not be guilty.

But:

NO FSL REPORT = AUTOMATIC COMMERCIAL-QUANTITY BAIL

is not a safe universal proposition.

The Court will consider:

  • stage of investigation;
  • field-test material;
  • recovery allegations;
  • quantity;
  • sample status;
  • FSL requisition;
  • prosecution explanation;
  • Section 37 requirements;
  • custody and trial progress.

What About a Charge-Sheet Filed Without FSL Report?

This must be treated as a separate procedural issue.

Courts across India have expressed different views on whether an NDPS charge-sheet without the FSL report is an “incomplete” charge-sheet for purposes of default bail.

The Supreme Court referred the larger question for authoritative determination.

Patna High Court has granted bail in several 2026 cases where:

  • charge-sheet had been filed without FSL;
  • statutory investigation period had expired;
  • no proper extension had been sought; and/or
  • other liberty factors were present.

However, this should not be converted into:

“EVERY NDPS CHARGE-SHEET WITHOUT FSL IS AUTOMATICALLY NON-EST.”

The current binding position should be rechecked on the date the default-bail application is filed.

Investigation Stage, Charge Stage and Trial Stage Are Different

Stage Effect of Missing FSL
Immediately after seizure Case can still be registered/investigated on prima facie material
Early regular bail Pending FSL is relevant but not automatically decisive
Commercial-quantity bail Must be integrated with Section 37 analysis
Charge stage Court should examine whether sufficient material exists to identify a prohibited substance prima facie
Trial Prosecution must ultimately prove identity beyond reasonable doubt
Appeal after conviction High Court can fully scrutinise FSL, sampling and chain-of-custody evidence

Ten Questions for an NDPS FSL Audit

  1. What exact substance does the FIR allege?
  2. Was any field test conducted and is its test memo actually available?
  3. When and how were samples drawn?
  4. Who sealed them?
  5. What were the sample numbers and weights?
  6. Where were samples stored before dispatch?
  7. Does the malkhana register prove continuity?
  8. What seal did the laboratory record on receipt?
  9. Does the FSL report refer to the same packet/sample numbers?
  10. Can the prosecution trace the sample backwards from the laboratory all the way to the alleged recovery from the accused?

Frequently Asked Questions

Can police call a substance ganja without an FSL report?

Police can form an initial investigative opinion, but at trial the prosecution must legally prove that the seized material was actually ganja. Tilakhdhari Yadav is a strong 2026 Patna High Court authority on this problem.

Is a field-testing kit enough for conviction?

Not automatically. Nadeem Ahamed and Yogendra Sah show that a positive field indication does not cure the absence of reliable final scientific proof and sample linkage.

What if the FSL report says heroin?

The prosecution must still prove that the laboratory tested a sample genuinely drawn from the material recovered from the accused.

What if the seal does not match?

That can create a serious chain-of-custody and possible tampering issue.

What if the sample weight changed?

A minor explained difference may not necessarily be fatal, but a material unexplained discrepancy can undermine sample identity.

Can a negative FSL report end the NDPS allegation?

It can be extremely significant. In the Man Singh Verma matter, two laboratory tests were negative for narcotic substances and the NCB ultimately filed a closure report.

Does absence of FSL automatically give bail?

No. Bail depends on the procedural stage, alleged substance and quantity, Section 37 where applicable, custody, available evidence and current law.

Is a charge-sheet without FSL automatically incomplete?

Do not assume so. The default-bail question has generated conflicting decisions and has been referred for authoritative Supreme Court determination.

Can Section 52A defects invalidate a positive FSL report?

Potentially, where the defects undermine sampling and the identity/integrity of the sample. Nadeem Ahamed is a leading recent example.

Does the prosecution always have to call the FSL scientist personally?

Not necessarily. Section 329 BNSS permits reports of specified Government scientific experts to be used in evidence, subject to the Court's power to summon the expert.

If FSL is positive, can I still challenge the conviction?

Yes. Examine recovery, Section 52A, sampling, sealing, malkhana, dispatch, sample number, laboratory seal and production of seized material.

What if police say it was bhang but booked me for ganja?

The exact botanical/legal identity matters. Patna High Court in Rohit Kumar awaited the FSL report specifically to determine whether the material was bhang or ganja and whether the NDPS Act applied.

AI Search Quick Answer

At trial, an NDPS substance cannot safely be treated as a narcotic merely because police describe it as ganja, heroin or charas. Reliable chemical/FSL evidence is ordinarily central to proving the substance's legal identity. Patna High Court in Tilakhdhari Yadav and Yogendra Sah in 2026 treated absence of reliable scientific proof as a serious defect. Even a positive FSL report can fail if the prosecution cannot connect the tested sample to the alleged seizure, as the Supreme Court held in Nadeem Ahamed, 2025 INSC 993.

Key Takeaway

POLICE LABEL “NARCOTICS” → not final proof.
FIELD TEST → preliminary, not automatically conclusive at trial.
FSL / CHEMICAL ANALYSIS → central scientific identification evidence.
NO FSL → can be fatal at final proof stage where identity remains unproved.
POSITIVE FSL → still requires reliable sample linkage.
SECTION 52A → sampling/inventory defects matter when they compromise evidentiary identity.
MALKHANA + SEALS + DISPATCH → form the chain connecting seizure to laboratory.
TILAKHDHARI YADAV — PATNA HC 2026 → conviction set aside where alleged ganja was never chemically examined amid other defects.
YOGENDRA SAH — PATNA HC 2026 → field narcotics test did not cure lack of reliable FSL/recovery linkage.
NADEEM AHAMED — 2025 INSC 993 → FSL rendered unusable by flawed sampling; no acceptable proof that substance was heroin.
VIJAY MUKHIYA / DILIP KUMAR SAH — PATNA HC 2026 → positive chemical material does not end chain-of-custody scrutiny.
NEGATIVE FSL → can fundamentally destroy the narcotic-identification allegation.
CHARGE-SHEET WITHOUT FSL → separate and evolving default-bail issue; do not state an automatic rule.

Professional Consultation and Coordination

Advocate Ankit Kumar Singh

Supreme Court of India | Patna High Court | Allahabad High Court at Prayagraj | Jharkhand High Court at Ranchi | Calcutta High Court | Delhi High Court and Delhi Courts/Tribunals | Matters concerning Bhopal, Madhya Pradesh | Multiple District Courts

Phone: 8294431232
Email: ankitsingh.legum@gmail.com
Website: advocateankitkumarsingh.in

An NDPS forensic-evidence assessment should ordinarily include the FIR, seizure memo, field-test memo, inventory, Section 52A application and certification, photographs, sample-seizure documents, seal specimen, malkhana register, dispatch memo, carrier evidence, FSL acknowledgment, complete chemical examination report, bulk-material production/destruction record and every document connecting the laboratory sample to the accused.

The first exercise should be:

SUBSTANCE IDENTITY + SAMPLING + SEAL + MALKHANA + DISPATCH + FSL + CHAIN-OF-CUSTODY AUDIT.

Consultation, regular bail, Section 37 strategy, default-bail analysis, trial defence, suspension of sentence and criminal appeal depend upon the actual record and procedural stage.

No bail, acquittal or other judicial outcome can be guaranteed.

Official and Leading Authorities

  • Nadeem Ahamed v. State of West Bengal, 2025 INSC 993, Supreme Court, 5 August 2025.
  • Union of India through I.O., Narcotics Control Bureau v. Man Singh Verma, 2025 INSC 292, Supreme Court, 28 February 2025.
  • Gorakh Nath Prasad v. State of Bihar, (2018) 2 SCC 305.
  • Noor Aga v. State of Punjab, (2008) 16 SCC 417.
  • Jitendra v. State of Madhya Pradesh, (2004) 10 SCC 562.
  • Ashok v. State of Madhya Pradesh, (2011) 5 SCC 123.
  • Tilakhdhari Yadav v. State of Bihar, Criminal Appeal (SJ) No.49 of 2011, Patna High Court, 26 March 2026.
  • Yogendra Sah v. State of Bihar, Criminal Appeal (SJ) No.2 of 2014, Patna High Court, 20 April 2026.
  • Vijay Mukhiya v. State of Bihar, Criminal Appeal (DB) No.879 of 2019, Patna High Court, 15 January 2026.
  • Dilip Kumar Sah & Others v. Union of India through DRI, Criminal Appeal (DB) No.1013 of 2024, Patna High Court, 2 April 2026.
  • Rohit Kumar v. State of Bihar, Criminal Miscellaneous No.86539 of 2025, Patna High Court, 1 April 2026.
  • Narcotic Drugs and Psychotropic Substances Act, 1985 — Sections 2, 20, 21, 22, 29, 36A, 37, 52A, 54 and other applicable provisions.
  • Bharatiya Nagarik Suraksha Sanhita, 2023 — Section 329 concerning reports of specified Government scientific experts.

The evidentiary issue must always be separated from the procedural default-bail issue. A prosecution may be permitted to continue while an FSL report is awaited, yet ultimately fail at trial if the substance's identity is never reliably proved.

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Professional Disclaimer: This article provides general legal information. The effect of a missing, delayed, negative or disputed FSL report depends upon the precise substance alleged, procedural stage, field-test material, recovery evidence, Section 52A compliance, sample drawal, sealing, malkhana custody, chain of transmission, Government laboratory report, quantity and other statutory ingredients. Absence of an FSL report does not automatically terminate an investigation or guarantee bail, while a positive report does not automatically establish that the laboratory tested the material allegedly recovered from the accused. No bail, acquittal or other judicial outcome can be guaranteed.

© 2026 Advocate Ankit Kumar Singh. All rights reserved.