Evidence checklist
Defective product evidence checklist
The product is often the most important piece of evidence in a defect claim. Repairing, discarding, returning, disassembling, or allowing an insurer or manufacturer to take it can prevent independent inspection and create a dispute about what failed.
Make the scene safe and follow emergency instructions. Do not handle a burned battery, energized appliance, pressurized item, contaminated product, or unstable machine merely to preserve evidence.
Published August 23, 2026 · Last reviewed August 23, 2026
Product identity and custody
A precise product identity connects the item to its manufacturer, production run, warnings, recalls, and design. A custody log shows that the inspected item is the one involved and what happened to it afterward.
- Identifiers: Brand, model, serial number, lot or batch, date code, VIN, component number, and manufacturing labels.
- All physical parts: Main product, broken pieces, battery, charger, packaging, fasteners, guards, accessories, fluids, and debris.
- Custody log: Who found, moved, stored, photographed, inspected, or received the item, with dates and reasons.
Incident and condition
Documenting the product before cleanup or repair helps experts distinguish a design issue, manufacturing departure, inadequate warning, misuse, maintenance problem, or unrelated damage.
- Scene photographs: Product position, controls, connections, surrounding damage, fire pattern, guards, warnings, and nearby equipment.
- Use immediately before failure: Who was using it, task, settings, load, duration, sounds, smells, heat, prior behavior, and the exact failure sequence.
- Witness and system records: Witnesses, security video, vehicle data, smart-device logs, alarm records, fire report, and emergency response.
Purchase, warnings, and history
The sales and maintenance history can identify sellers and distributors and show whether the product was altered. Keep the warnings actually supplied with the product because a current online manual may be different.
- Transaction records: Receipt, order history, seller, distributor, installation invoice, warranty registration, and financing record.
- Instructions and warnings: Manual, label, package, on-screen warning, assembly instructions, marketing claims, and safety notice.
- Service and prior problems: Repairs, modifications, maintenance, complaints, support chats, warranty claims, replacement parts, and prior failures.
Recall, injury, and loss records
A recall can identify a known risk and affected production range, but it does not alone prove defect or causation in an individual case. Injury and loss evidence must still connect the failure to the harm.
- Recall research: Agency notice, affected identifiers, remedy, date checked, and any manufacturer or retailer communication.
- Medical record: Emergency findings, burns or trauma, imaging, surgery, treatment, restrictions, prognosis, and future care.
- Property and income loss: Fire or water damage, replacement cost, lost earnings, insurer inspections, estimates, and payments.
A safe preservation rule
Preserve; do not investigate at personal risk. Keep original files and objects, record where they came from, and avoid editing, repairing, washing, testing, returning, or posting them publicly. Do not record private conversations or enter property unless the law and the circumstances permit it.
This checklist is general information. An attorney can identify evidence held by other people, send a targeted preservation demand, and apply the law of the state where the event occurred.
Use the checklist with these guides
Preserving the product
Why the manufacturer wants it back, and what happens if you send it.
Read thisThe three kinds of defect
Three theories, proven three different ways. Which you have shapes everything.
Read thisRecalls
Helpful evidence. Not an admission, and not a substitute for a claim.
Read thisDeadlines and repose
A statute of repose can bar a claim before the injury even occurred.
Read thisDo not wait for records to disappear
A free review can identify the evidence controlled by a business, employer, platform, provider, or manufacturer and whether a preservation request is warranted.
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