Food Adulteration and Authenticity Testing: Designing Evidence That Answers the Right Question

Testing or auditing is valuable only when the result is tied to a defined decision. The questions below should be agreed before sampling so that the sample, method, specification and response are aligned.

A single abnormal parameter can be a useful trigger but may have several explanations. Low milk fat can arise from formulation, sampling, process separation or substitution; unusual spice colour can reflect variety, processing or added colour; and a changed fatty-acid profile can arise from raw-material origin as well as mixing. Strong conclusions combine orthogonal evidence—multiple measurements that address the same hypothesis through different scientific properties.

Reference samples are particularly valuable. When investigating a supplier or batch change, compare suspect material with an authenticated control of the same declared product, season or grade where possible. Without suitable references and a validated decision model, sophisticated fingerprint data can still be difficult to translate into a regulatory allegation.

• Write the suspected adulteration mechanism before selecting tests.
• Separate screening methods from confirmatory methods; rapid checks can triage samples but may not be suitable as final evidence.
• Use more than one independent compositional or marker line when a high-consequence conclusion is required.
• Preserve original packaging, invoice and chain-of-custody records during disputes.
• Do not convert an out-of-specification result automatically into an accusation of deliberate adulteration.

FSSAI product standards and analysis manuals should anchor the investigation. The applicable manual may contain classical compositional tests, marker tests or instrumental approaches. For some modern authenticity questions, additional validated techniques can be needed, but they should be used with a clear validation basis, reference materials and interpretation rule rather than as an unexplained fingerprint.

A method number is not, by itself, a product specification or legal limit. The method tells the laboratory how a defined measurand is determined; the applicable regulation, product standard, consent, customer specification or validated internal plan supplies the criterion and decision context.

Authenticity sampling must guard against bias and tampering. If a supplier lot is suspected, define which units belong to that lot and sample in a way that cannot be dismissed as selective. For bulk foods, take increments from appropriate locations. In disputes, sealed split samples and witnessed sampling may be appropriate under the governing procedure.

The sample should preserve the commercial state of the product. Repacking, removing labels, blending units or preparing the material before its identity is documented can destroy evidence. Genuine reference samples should also have known provenance; an unknown 'good sample' is not a reliable comparator.

• Photograph labels, seals, lot codes and bulk-container identification before opening.
• Record who sampled, where, when, how and with which tools.
• For layered or non-homogeneous products, use a documented homogenization/compositing plan suited to the question.
• Retain an unopened unit or sealed split where feasible for independent confirmation.
• Provide genuine reference samples only when their provenance is documented.

Interpretation should state exactly what the evidence supports. 'Detected added starch by the specified method' is stronger and more transparent than a vague statement that a product is fake. If a compositional result does not meet a product standard, report the nonconforming parameter and criterion. If several independent markers support substitution, explain the combined basis and remaining limitations.

Intent is normally outside the analytical measurement. A laboratory can provide evidence of composition, detected markers or inconsistency with a declared standard; commercial or enforcement conclusions about deliberate fraud require the wider investigative record.

Authenticity control is strongest upstream. Approved suppliers, specifications, incoming checks, price/market intelligence, traceability and periodic targeted testing reduce the chance that a problem reaches the consumer. Testing should be concentrated where economic incentive and vulnerability are highest rather than applied randomly with the same panel to every material.

A vulnerability assessment should be revisited when prices spike, supply routes change, shortages occur or a new supplier is introduced. Laboratory evidence then becomes one element of a broader food-fraud prevention system.

• Create a vulnerability assessment covering high-value ingredients, variable commodities and opaque supply chains.
• Use incoming identity checks appropriate to the ingredient before it is commingled into production.
• Retain supplier and batch reference samples for critical raw materials.
• Escalate unusual price, sensory characteristics or documentation into targeted laboratory investigation.
• Close the loop with supplier CAPA, procurement controls and enhanced verification after a confirmed issue.

Standards, regulations and official methods are revised over time. Before a result is used for a regulatory conformity decision, confirm the current FSSAI notification or Gazette text, the exact food or water category, the latest applicable BIS edition and amendments, the customer or statutory specification, the sampling requirement and the laboratory method/scope. FSSAI compendia are useful ready references, but the original notifications and amendments prevail where there is a conflict. This article is technical guidance, not a substitute for the applicable law, permit or product specification.

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• FSSAI Manual(s) of Method(s) of Analysis
• FSSAI Food Safety and Standards Regulations
• BIS Indian Standards portal
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