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Expert Witness Insights by Area of Expertise
10 min read
Areas of Expertise :
Food Safety, Food Processing, Supply Chain Management, Food And Drug Administration (FDA), Microbiology
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Food safety in the supply chain requires identifying and controlling contamination risks from production through transportation and distribution. This article explains FSMA preventive controls, supplier oversight, sanitation, traceability, transportation, employee training, recordkeeping, and how experts may analyze contamination disputes.
Food can pass through farms, processing facilities, warehouses, transportation networks, distributors, retailers, and restaurants before reaching consumers. At each stage, contamination can occur if appropriate controls are not maintained.
Preventing food contamination therefore involves more than inspecting the finished product. Effective food-safety programs identify hazards throughout the supply chain, establish controls suited to those hazards, monitor whether the controls are working, and maintain records that can help businesses respond when something goes wrong.
In the United States, the Food Safety Modernization Act (FSMA) strengthened the federal focus on preventing food-safety problems rather than relying primarily on responses after contamination occurs. The regulatory framework addresses areas such as preventive controls, produce safety, imported foods, sanitary transportation, intentional adulteration, and enhanced traceability for certain foods.
For attorneys evaluating a contamination event, supplier records, sanitation logs, temperature data, testing results, traceability records, and other documentation may help determine where a problem began, when it occurred, and which controls were in place.
Food contamination can occur at nearly any point between production and consumption. The particular risks depend on the food, facility, process, equipment, employees, suppliers, and distribution system involved.
Common food-safety hazards include biological, chemical, and physical hazards. Chemical hazards can include food allergens as well as substances such as certain pesticides, natural toxins, and chemical contaminants. Depending on the applicable regulatory framework, businesses may also need to address intentional adulteration through separate food-defense requirements.
A single hazard can arise at several points in the supply chain. Improper temperature control, for example, could occur during processing, storage, transportation, or retail handling. Effective prevention requires understanding what could go wrong, where a hazard could arise, and which control is intended to address it.
Under FDA's Preventive Controls for Human Food rule, covered facilities generally must prepare, or have prepared, and implement a written food-safety plan. The plan must include a written hazard analysis and, when hazards requiring preventive controls are identified, written preventive controls appropriate to those hazards.
Depending on the facility and hazards, those controls may include process controls, food allergen controls, sanitation controls, supply-chain controls, and other controls necessary to significantly minimize or prevent an identified hazard.
Covered facilities also have responsibilities involving monitoring, corrections or corrective actions, verification, and associated records. Specific obligations depend on the regulations applicable to the operation, including exemptions and modified requirements.
When a hazard requiring a preventive control is identified, covered facilities must also establish a written recall plan for the food, subject to applicable requirements. The plan addresses procedures such as notifying direct consignees, notifying the public when appropriate, conducting effectiveness checks, and appropriately disposing of recalled food.
The important point is that a food-safety plan should reflect the hazards of the actual operation rather than rely on a generic checklist.
Laboratory Testing
Regulatory Issues
Evidence Analysis
Environmental Sampling
Food can pass through farms, processing facilities, warehouses, transportation networks, distributors, retailers, and restaurants before reaching consumers. At each stage, contamination can occur if appropriate controls are not maintained.
Preventing food contamination therefore involves more than inspecting the finished product. Effective food-safety programs identify hazards throughout the supply chain, establish controls suited to those hazards, monitor whether the controls are working, and maintain records that can help businesses respond when something goes wrong.
In the United States, the Food Safety Modernization Act (FSMA) strengthened the federal focus on preventing food-safety problems rather than relying primarily on responses after contamination occurs. The regulatory framework addresses areas such as preventive controls, produce safety, imported foods, sanitary transportation, intentional adulteration, and enhanced traceability for certain foods.
For attorneys evaluating a contamination event, supplier records, sanitation logs, temperature data, testing results, traceability records, and other documentation may help determine where a problem began, when it occurred, and which controls were in place.
Food contamination can occur at nearly any point between production and consumption. The particular risks depend on the food, facility, process, equipment, employees, suppliers, and distribution system involved.
Common food-safety hazards include biological, chemical, and physical hazards. Chemical hazards can include food allergens as well as substances such as certain pesticides, natural toxins, and chemical contaminants. Depending on the applicable regulatory framework, businesses may also need to address intentional adulteration through separate food-defense requirements.
A single hazard can arise at several points in the supply chain. Improper temperature control, for example, could occur during processing, storage, transportation, or retail handling. Effective prevention requires understanding what could go wrong, where a hazard could arise, and which control is intended to address it.
Under FDA's Preventive Controls for Human Food rule, covered facilities generally must prepare, or have prepared, and implement a written food-safety plan. The plan must include a written hazard analysis and, when hazards requiring preventive controls are identified, written preventive controls appropriate to those hazards.
Depending on the facility and hazards, those controls may include process controls, food allergen controls, sanitation controls, supply-chain controls, and other controls necessary to significantly minimize or prevent an identified hazard.
Covered facilities also have responsibilities involving monitoring, corrections or corrective actions, verification, and associated records. Specific obligations depend on the regulations applicable to the operation, including exemptions and modified requirements.
When a hazard requiring a preventive control is identified, covered facilities must also establish a written recall plan for the food, subject to applicable requirements. The plan addresses procedures such as notifying direct consignees, notifying the public when appropriate, conducting effectiveness checks, and appropriately disposing of recalled food.
The important point is that a food-safety plan should reflect the hazards of the actual operation rather than rely on a generic checklist.
A strong contamination-prevention program starts with a systematic hazard analysis.
For facilities covered by the Preventive Controls for Human Food rule, the hazard analysis must consider known or reasonably foreseeable biological, chemical, and physical hazards. FDA's framework also addresses hazards that occur naturally, are unintentionally introduced, or are intentionally introduced for economic gain when they affect food safety.
In addition to considering the operation as a whole, a useful hazard analysis examines hazards associated with significant steps in the process. Questions may include:
Controls that are appropriate for one operation may be inadequate or unnecessary for another.
Contamination prevention does not begin at the receiving dock. Ingredients and food products may arrive with hazards that originated upstream.
When a receiving facility identifies a hazard requiring a supply-chain-applied control, FDA's preventive-controls framework contains requirements governing supply-chain programs, subject to applicable conditions and exceptions.
Supplier-management practices may include evaluating supplier performance and food-safety history, establishing specifications, conducting appropriate verification activities, reviewing relevant documentation, and using sampling or testing when justified by the hazard.
Imported foods can create additional responsibilities. Under FSMA's Foreign Supplier Verification Programs (FSVP) rule, covered importers must conduct risk-based activities to verify that foreign suppliers produce food in a manner that provides the required level of public-health protection under applicable U.S. food-safety requirements and that the food is not adulterated or misbranded with respect to allergen labeling.
Consider a packaged food recalled after an undeclared allergen is discovered. Depending on the facts, an investigation might examine supplier specifications, receiving records, formulations, production schedules, changeover procedures, cleaning records, allergen controls, label-verification records, lot records, and distribution information.
The evidence could point to several possibilities. An ingredient supplier may have provided incomplete information. Cross-contact may have occurred on shared equipment. The correct product may have been placed in the wrong packaging. A label-verification procedure may not have been followed.
For attorneys and experts, this illustrates why a contamination dispute may require reconstructing events across several parts of an operation rather than focusing on a single test result or document.
Sanitation failures can allow contaminants to move between employees, equipment, surfaces, raw materials, and finished products.
FDA's preventive-controls regulations recognize sanitation controls as one type of preventive control that may be necessary when identified hazards require them. Depending on the facility and hazard, sanitation controls may include procedures, practices, and processes addressing the cleanliness of food-contact surfaces and the prevention of allergen cross-contact and cross-contamination from insanitary objects, personnel, and raw product to processed product.
Environmental monitoring is required when contamination of a ready-to-eat food with an environmental pathogen is identified as a hazard requiring a preventive control, as provided by the applicable preventive-controls requirements.
Records can help establish whether sanitation procedures were performed consistently and whether deviations were identified and addressed.
Food-safety considerations can continue after a product leaves the processing facility, and transportation may be subject to separate sanitary requirements depending on the food, operation, parties involved, and applicable regulatory provisions.
FDA's Sanitary Transportation of Human and Animal Food rule establishes requirements for certain shippers, loaders, carriers, and receivers involved in transportation by motor or rail vehicle.
For transportation operations subject to the rule, applicable requirements may involve suitable vehicles and transportation equipment, sanitary transportation operations, appropriate temperature control for foods that require it for safety, protection against contamination and allergen cross-contact, training in specified circumstances, and required records. The particular responsibilities depend on the food, transportation operation, role of the party, applicable agreements, and regulatory provisions.
When contamination is suspected, determining where affected food came from and where it went can improve the response.
FDA's Food Traceability Rule establishes additional recordkeeping requirements for persons who manufacture, process, pack, or hold foods included on the Food Traceability List, subject to the rule's scope and exemptions. Covered entities must maintain specified Key Data Elements associated with Critical Tracking Events.
The rule originally had a compliance date of January 20, 2026. FDA proposed extending that compliance date by 30 months to July 20, 2028. As of August 20, 2026, FDA continued to identify the compliance-date extension as a proposed rule. Separately, the Continuing Appropriations, Agriculture, Legislative Branch, Military Construction and Veterans Affairs, and Extensions Act, 2026 directed FDA not to enforce the Food Traceability Rule before July 20, 2028. FDA has stated that it intends to comply with that congressional directive.
The enforcement delay does not eliminate the practical value of traceability. Accurate lot identification and supply-chain records can help businesses investigate complaints, identify potentially affected products, reconstruct distribution, and support targeted recall decisions.
FDA's Intentional Adulteration rule addresses intentional adulteration intended to cause wide-scale public-health harm. Subject to coverage and exemptions, covered facilities must develop and implement a food-defense plan that includes vulnerability assessment, mitigation strategies, monitoring, corrective actions, verification, training, and recordkeeping.
This framework should be distinguished from preventive controls. The Intentional Adulteration rule focuses on deliberate acts intended to cause wide-scale public-health harm. Other food-safety requirements may address hazards that occur naturally, are unintentionally introduced, or, in certain circumstances, are intentionally introduced for economic gain.
A written procedure cannot prevent contamination if it is not followed or does not work as intended.
Monitoring can provide evidence that a control is being performed. Verification can help determine whether preventive controls are consistently implemented and effective. When something goes wrong, appropriate corrective action can address affected food and reduce the chance of recurrence.
Businesses may need to determine when a deviation began, which products were affected, whether potentially affected food was distributed, whether a control failed or was improperly implemented, and what records document the response.
Facilities subject to the applicable food-safety-plan requirements must reanalyze the food-safety plan as a whole at least once every three years. Reanalysis of the plan as a whole or the applicable portion is also required in specified circumstances, including when a significant operational change creates a reasonable potential for a new hazard or a significant increase in a previously identified hazard, when new information about potential hazards becomes known, when appropriate after an unanticipated food-safety problem, or when a preventive control, combination of preventive controls, or the food-safety plan as a whole is found ineffective.
Under FDA's Current Good Manufacturing Practice requirements, individuals engaged in manufacturing, processing, packing, or holding food must be qualified to perform their assigned duties through appropriate education, training, experience, or a combination appropriate to their responsibilities.
Training should correspond to an employee's role. Someone responsible for allergen changeovers may need different instruction from an employee monitoring refrigeration or receiving ingredients.
Records documenting the food-hygiene and food-safety training required by 21 CFR § 117.4(b)(2) must be established and maintained in accordance with the applicable recordkeeping requirements. Beyond documenting completion, businesses may also consider how they evaluate whether employees can consistently perform the procedures associated with their responsibilities.
When contamination results in litigation, regulatory scrutiny, a recall dispute, or an insurance claim, qualified experts may help attorneys understand technical evidence.
Depending on the issues in dispute and the expert's qualifications, technical analysis may involve food-safety plans, processing procedures, sanitation programs, temperature records, supplier documentation, traceability information, laboratory results, training records, regulatory requirements, and possible contamination pathways.
Depending on the technical questions presented, relevant expertise could come from fields such as food science, microbiology, epidemiology, toxicology, chemistry, engineering, or supply-chain operations.
Experts can provide technical analysis and opinions within the scope of their qualifications and the governing evidentiary rules. Counsel develops legal arguments, while courts decide questions of law and determine the admissibility of expert testimony. Disputed factual issues are resolved by the appropriate factfinder.
When expert testimony is offered in litigation, admissibility depends on the governing evidentiary rules and jurisdiction. In federal proceedings governed by the Federal Rules of Evidence, Rule 702 provides the principal expert-specific admissibility standard, although other evidentiary rules may also apply depending on the testimony and evidence offered.
Food safety is strongest when prevention is built into each stage of the supply chain.
Hazard analysis, supplier oversight, sanitation, process controls, transportation practices, traceability, employee training, and documented verification can all contribute to reducing contamination risk. No system can eliminate every possible incident, but a well-designed and consistently implemented preventive program can reduce risk and improve an organization's ability to respond when a problem occurs.
For attorneys handling contamination disputes, the key questions may include where contamination originated, when it occurred, which controls were intended to address the hazard, whether those controls were implemented, and what the scientific and operational evidence can reliably establish.
What is the most effective way to prevent contamination?
There is no single control that prevents every type of contamination. Prevention begins with identifying relevant hazards and implementing controls appropriate to the product, process, facility, suppliers, and distribution system.
What records may matter in a food contamination dispute?
Depending on the issues, relevant evidence may include food-safety plans, supplier records, sanitation logs, production records, temperature data, testing results, training records, traceability information, shipping records, and recall documentation.
Does FSMA require every food business to have the same food-safety plan?
No. Requirements vary according to the operation and applicable regulation, and exemptions or modified requirements may apply.
Why is food traceability important?
Traceability can help businesses and investigators identify the source and distribution of potentially contaminated food and can support outbreak investigations and recalls.
How can experts assist in food contamination litigation?
Qualified experts can analyze technical evidence involving processing, sanitation, microbiology, testing, supplier controls, transportation, traceability, and other relevant subjects. Their role depends on the dispute, their qualifications, and the applicable legal and evidentiary framework.
A strong contamination-prevention program starts with a systematic hazard analysis.
For facilities covered by the Preventive Controls for Human Food rule, the hazard analysis must consider known or reasonably foreseeable biological, chemical, and physical hazards. FDA's framework also addresses hazards that occur naturally, are unintentionally introduced, or are intentionally introduced for economic gain when they affect food safety.
In addition to considering the operation as a whole, a useful hazard analysis examines hazards associated with significant steps in the process. Questions may include:
Controls that are appropriate for one operation may be inadequate or unnecessary for another.
Contamination prevention does not begin at the receiving dock. Ingredients and food products may arrive with hazards that originated upstream.
When a receiving facility identifies a hazard requiring a supply-chain-applied control, FDA's preventive-controls framework contains requirements governing supply-chain programs, subject to applicable conditions and exceptions.
Supplier-management practices may include evaluating supplier performance and food-safety history, establishing specifications, conducting appropriate verification activities, reviewing relevant documentation, and using sampling or testing when justified by the hazard.
Imported foods can create additional responsibilities. Under FSMA's Foreign Supplier Verification Programs (FSVP) rule, covered importers must conduct risk-based activities to verify that foreign suppliers produce food in a manner that provides the required level of public-health protection under applicable U.S. food-safety requirements and that the food is not adulterated or misbranded with respect to allergen labeling.
Consider a packaged food recalled after an undeclared allergen is discovered. Depending on the facts, an investigation might examine supplier specifications, receiving records, formulations, production schedules, changeover procedures, cleaning records, allergen controls, label-verification records, lot records, and distribution information.
The evidence could point to several possibilities. An ingredient supplier may have provided incomplete information. Cross-contact may have occurred on shared equipment. The correct product may have been placed in the wrong packaging. A label-verification procedure may not have been followed.
For attorneys and experts, this illustrates why a contamination dispute may require reconstructing events across several parts of an operation rather than focusing on a single test result or document.
Sanitation failures can allow contaminants to move between employees, equipment, surfaces, raw materials, and finished products.
FDA's preventive-controls regulations recognize sanitation controls as one type of preventive control that may be necessary when identified hazards require them. Depending on the facility and hazard, sanitation controls may include procedures, practices, and processes addressing the cleanliness of food-contact surfaces and the prevention of allergen cross-contact and cross-contamination from insanitary objects, personnel, and raw product to processed product.
Environmental monitoring is required when contamination of a ready-to-eat food with an environmental pathogen is identified as a hazard requiring a preventive control, as provided by the applicable preventive-controls requirements.
Records can help establish whether sanitation procedures were performed consistently and whether deviations were identified and addressed.
Food-safety considerations can continue after a product leaves the processing facility, and transportation may be subject to separate sanitary requirements depending on the food, operation, parties involved, and applicable regulatory provisions.
FDA's Sanitary Transportation of Human and Animal Food rule establishes requirements for certain shippers, loaders, carriers, and receivers involved in transportation by motor or rail vehicle.
For transportation operations subject to the rule, applicable requirements may involve suitable vehicles and transportation equipment, sanitary transportation operations, appropriate temperature control for foods that require it for safety, protection against contamination and allergen cross-contact, training in specified circumstances, and required records. The particular responsibilities depend on the food, transportation operation, role of the party, applicable agreements, and regulatory provisions.
When contamination is suspected, determining where affected food came from and where it went can improve the response.
FDA's Food Traceability Rule establishes additional recordkeeping requirements for persons who manufacture, process, pack, or hold foods included on the Food Traceability List, subject to the rule's scope and exemptions. Covered entities must maintain specified Key Data Elements associated with Critical Tracking Events.
The rule originally had a compliance date of January 20, 2026. FDA proposed extending that compliance date by 30 months to July 20, 2028. As of August 20, 2026, FDA continued to identify the compliance-date extension as a proposed rule. Separately, the Continuing Appropriations, Agriculture, Legislative Branch, Military Construction and Veterans Affairs, and Extensions Act, 2026 directed FDA not to enforce the Food Traceability Rule before July 20, 2028. FDA has stated that it intends to comply with that congressional directive.
The enforcement delay does not eliminate the practical value of traceability. Accurate lot identification and supply-chain records can help businesses investigate complaints, identify potentially affected products, reconstruct distribution, and support targeted recall decisions.
FDA's Intentional Adulteration rule addresses intentional adulteration intended to cause wide-scale public-health harm. Subject to coverage and exemptions, covered facilities must develop and implement a food-defense plan that includes vulnerability assessment, mitigation strategies, monitoring, corrective actions, verification, training, and recordkeeping.
This framework should be distinguished from preventive controls. The Intentional Adulteration rule focuses on deliberate acts intended to cause wide-scale public-health harm. Other food-safety requirements may address hazards that occur naturally, are unintentionally introduced, or, in certain circumstances, are intentionally introduced for economic gain.
A written procedure cannot prevent contamination if it is not followed or does not work as intended.
Monitoring can provide evidence that a control is being performed. Verification can help determine whether preventive controls are consistently implemented and effective. When something goes wrong, appropriate corrective action can address affected food and reduce the chance of recurrence.
Businesses may need to determine when a deviation began, which products were affected, whether potentially affected food was distributed, whether a control failed or was improperly implemented, and what records document the response.
Facilities subject to the applicable food-safety-plan requirements must reanalyze the food-safety plan as a whole at least once every three years. Reanalysis of the plan as a whole or the applicable portion is also required in specified circumstances, including when a significant operational change creates a reasonable potential for a new hazard or a significant increase in a previously identified hazard, when new information about potential hazards becomes known, when appropriate after an unanticipated food-safety problem, or when a preventive control, combination of preventive controls, or the food-safety plan as a whole is found ineffective.
Under FDA's Current Good Manufacturing Practice requirements, individuals engaged in manufacturing, processing, packing, or holding food must be qualified to perform their assigned duties through appropriate education, training, experience, or a combination appropriate to their responsibilities.
Training should correspond to an employee's role. Someone responsible for allergen changeovers may need different instruction from an employee monitoring refrigeration or receiving ingredients.
Records documenting the food-hygiene and food-safety training required by 21 CFR § 117.4(b)(2) must be established and maintained in accordance with the applicable recordkeeping requirements. Beyond documenting completion, businesses may also consider how they evaluate whether employees can consistently perform the procedures associated with their responsibilities.
When contamination results in litigation, regulatory scrutiny, a recall dispute, or an insurance claim, qualified experts may help attorneys understand technical evidence.
Depending on the issues in dispute and the expert's qualifications, technical analysis may involve food-safety plans, processing procedures, sanitation programs, temperature records, supplier documentation, traceability information, laboratory results, training records, regulatory requirements, and possible contamination pathways.
Depending on the technical questions presented, relevant expertise could come from fields such as food science, microbiology, epidemiology, toxicology, chemistry, engineering, or supply-chain operations.
Experts can provide technical analysis and opinions within the scope of their qualifications and the governing evidentiary rules. Counsel develops legal arguments, while courts decide questions of law and determine the admissibility of expert testimony. Disputed factual issues are resolved by the appropriate factfinder.
When expert testimony is offered in litigation, admissibility depends on the governing evidentiary rules and jurisdiction. In federal proceedings governed by the Federal Rules of Evidence, Rule 702 provides the principal expert-specific admissibility standard, although other evidentiary rules may also apply depending on the testimony and evidence offered.
Food safety is strongest when prevention is built into each stage of the supply chain.
Hazard analysis, supplier oversight, sanitation, process controls, transportation practices, traceability, employee training, and documented verification can all contribute to reducing contamination risk. No system can eliminate every possible incident, but a well-designed and consistently implemented preventive program can reduce risk and improve an organization's ability to respond when a problem occurs.
For attorneys handling contamination disputes, the key questions may include where contamination originated, when it occurred, which controls were intended to address the hazard, whether those controls were implemented, and what the scientific and operational evidence can reliably establish.
What is the most effective way to prevent contamination?
There is no single control that prevents every type of contamination. Prevention begins with identifying relevant hazards and implementing controls appropriate to the product, process, facility, suppliers, and distribution system.
What records may matter in a food contamination dispute?
Depending on the issues, relevant evidence may include food-safety plans, supplier records, sanitation logs, production records, temperature data, testing results, training records, traceability information, shipping records, and recall documentation.
Does FSMA require every food business to have the same food-safety plan?
No. Requirements vary according to the operation and applicable regulation, and exemptions or modified requirements may apply.
Why is food traceability important?
Traceability can help businesses and investigators identify the source and distribution of potentially contaminated food and can support outbreak investigations and recalls.
How can experts assist in food contamination litigation?
Qualified experts can analyze technical evidence involving processing, sanitation, microbiology, testing, supplier controls, transportation, traceability, and other relevant subjects. Their role depends on the dispute, their qualifications, and the applicable legal and evidentiary framework.
Laboratory Testing
Regulatory Issues
Evidence Analysis
Environmental Sampling
Expert Witness Insights by Area of Expertise
Expert Witness Insights by Area of Expertise