A Product You Used Injured You. California's Strict Liability Law Does Not Require You to Prove the Manufacturer Was Careless.

Product Liability in California — Strict Liability and Three Defect Categories

California established strict products liability in Greenman v. Yuba Power Products (1963) 59 Cal.2d 57 — a landmark decision that shifted the burden from injured consumers to manufacturers. Under Greenman, a manufacturer is strictly liable for injuries caused by a defective product placed in commerce, without any requirement that the plaintiff prove negligence or fault in the manufacturing process.

Strict liability serves a policy rationale: manufacturers are in a better position than individual consumers to bear and spread the costs of product-related injuries through pricing, insurance, and quality control. The doctrine removes the evidentiary burden of proving exactly where in the design or manufacturing process a mistake was made — a nearly impossible task for individual consumers facing large corporations.

California recognizes three distinct categories of product defect. A manufacturing defect occurs when a specific unit deviates from the intended design — the design was safe, but a particular unit was incorrectly assembled, used substandard materials, or was contaminated during production. A design defect occurs when the entire product line is unreasonably dangerous — even a perfectly manufactured unit poses risks that could have been reduced through a reasonable alternative design. A failure to warn (or marketing defect) occurs when a product carries non-obvious risks that the manufacturer failed to communicate through adequate warnings or instructions.

Critically, strict liability extends beyond the original manufacturer to every entity in the commercial distribution chain. The component parts manufacturer, the assembler, the distributor, the wholesaler, and the retail seller who placed the product in the consumer's hands can all face strict liability. This "chain of commerce" doctrine is especially important when the manufacturer is a foreign entity, is insolvent, or cannot be served.

What to Do After a Defective Product Injury in California

Product liability cases turn on physical evidence. The defective product itself, its packaging, and the injury documentation must all be preserved immediately — manufacturers have far greater resources to reconstruct events than individual plaintiffs do.

1. 1
   Seek Medical Attention

   Get immediate medical treatment and ensure the treating physician documents the mechanism of injury — specifically, how the product caused the harm. A medical record that attributes the injury to the product is the foundation of the causation case. Follow all recommended treatment and keep all records.

2. 2
   Preserve the Product — Do Not Return or Discard It

   The defective product is the most critical piece of evidence in the case. Do not return it to the retailer, send it to the manufacturer, or discard it. Place it exactly as it was at the time of injury in a secure location. Returning a product to the manufacturer gives them physical control over the primary evidence in the case.

3. 3
   Photograph the Product and Defect in Detail

   Photograph the product from multiple angles — the overall unit, the specific component that failed, any warning labels present, the damage caused by the defect, and the injury scene. If the defect is a structural failure, a missing component, or inadequate labeling, document it clearly before any handling that could alter its condition.

4. 4
   Preserve All Packaging, Receipts, and Documentation

   Keep the original packaging, instruction manuals, warning labels, purchase receipts, and any online order confirmation or product registration records. These establish the chain of commerce — the manufacturer, importer, distributor, and retailer — and are essential for identifying all potentially liable defendants. Without purchase records, proving which product variant was involved can be difficult.

5. 5
   Write a Detailed Account of the Injury Circumstances

   Document exactly how and when you were using the product, whether you followed the provided instructions, what happened, and what injury resulted. Do this immediately — memory fades. The manufacturer's primary defense is often product misuse; a detailed contemporaneous account of normal intended use directly counters that argument.

6. 6
   Check for CPSC or NHTSA Recalls

   Search the U.S. Consumer Product Safety Commission recall database (cpsc.gov) and the National Highway Traffic Safety Administration database (nhtsa.gov) for your specific product model. A prior recall involving the same defect shows the manufacturer had prior knowledge — a critical fact for both liability and potential punitive damages. Do not register the recall or send the product in before consulting an attorney.

7. 7
   Consult a Licensed Attorney — Product Cases Require Expert Support

   Product liability cases are among the most complex personal injury cases — they require engineering, design, or medical experts to establish the defect and causation. They also involve corporations with substantial litigation resources. A licensed California attorney can coordinate expert analysis, identify all defendants in the distribution chain, and evaluate the full value of the claim before the statute of limitations runs.

Your Legal Rights in a California Product Liability Case

The Right to Pursue Strict Liability Without Proving Negligence

California's strict liability doctrine means an injured consumer does not need to prove that the manufacturer was careless, that any particular employee made a mistake, or that the defendant knew the product was defective. The plaintiff proves: (1) the product was defective; (2) the defect existed when the product left the defendant's control; and (3) the defect caused the injury. This lower burden of proof makes product liability claims more accessible than negligence claims against large manufacturers.

The Right to Sue Every Entity in the Distribution Chain

Every commercial entity that placed the defective product in the stream of commerce can be held strictly liable — the manufacturer, importer, component supplier, distributor, and retailer. This chain-of-commerce liability is important when the original manufacturer is a foreign corporation that cannot be served in the United States, is in bankruptcy, or lacks California assets. The retailer who sold the product may be the most easily reachable defendant.

The Right to Seek Punitive Damages for Knowing Concealment

Where a manufacturer knew of a product defect, knew it posed a risk of serious injury, and consciously failed to address it or warn consumers, punitive damages under Civil Code section 3294 may be available. Some of the largest civil jury verdicts in California history — in pharmaceutical, tobacco, and automotive cases — have involved punitive damages for corporate concealment of known product dangers.

How Liability Is Determined in California Product Liability Cases

Product liability uses strict liability — fault-based negligence analysis applies to negligent failure-to-warn and negligent design claims, but most California product liability cases are brought under strict liability, which does not require proof of fault.

Design defect — two tests. California applies two alternative tests for design defect. The consumer expectation test asks whether the product performed as safely as an ordinary consumer would expect when used in an intended or reasonably foreseeable manner. The risk-benefit test (from Barker v. Lull Engineering) asks whether the benefits of the design outweigh the risks of the design — with the burden on the manufacturer to justify the design choice.

Manufacturing defect. A manufacturing defect is established by showing the specific unit deviated from the manufacturer's own design specifications or from other units in the same product line. This is typically established through expert analysis of the failed component or through quality control records obtained in discovery.

Failure to warn. A failure-to-warn claim requires showing that the product carried non-obvious risks the manufacturer knew or should have known about, that no adequate warning was provided, and that a proper warning would have prevented the injury. The plaintiff must establish that they would have read and heeded a proper warning.

Comparative fault. California's pure comparative fault system applies to product liability cases. Product misuse, assumption of risk, and the plaintiff's own negligence can reduce — but not bar — recovery. The manufacturer bears the burden of proving that any comparative fault on the plaintiff's part was the cause of the claimed damages.

Insurance in Product Liability Cases

Product liability claims are typically resolved through a manufacturer's or retailer's commercial general liability (CGL) insurance or product liability insurance — not personal auto or homeowner's coverage.

Product liability insurance. Manufacturers and distributors typically carry product liability insurance that covers claims arising from products they make or distribute. These are claims-made or occurrence-based policies with per-occurrence and aggregate limits. Large manufacturers may carry umbrella or excess policies providing additional coverage.

Retailer indemnification. Retailers who face strict liability as sellers often have contractual indemnification rights against the manufacturer — allowing the retailer to be reimbursed by the manufacturer for damages paid to injured consumers. From the plaintiff's perspective, the retailer and manufacturer are both defendants; the indemnification dispute between them is a separate matter.

No insurance source. When a manufacturer is bankrupt, a foreign entity that cannot be reached, or a small operation with no insurance, the injured plaintiff may have no practical source of recovery from the manufacturer. In those cases, identifying every entity in the distribution chain — importers, domestic distributors, and the retail seller — becomes essential.

Evidence That Matters in Product Liability Cases

The defective product itself is the primary evidence — the physical object, preserved exactly as it was at the time of the injury, available for expert examination and testing. Its loss or alteration can be devastating to the case.

Engineering and design experts are typically required to establish that the product was defective — whether the defect was in the design, in the manufacturing process, or in the absence of adequate warnings. Expert testimony must identify the specific defect and explain causation.

The product's design and manufacturing records, obtained through discovery, reveal whether the manufacturer was aware of design risks, what testing was conducted, and whether alternative safer designs were considered and rejected.

CPSC and NHTSA recall records and consumer complaints establish whether the manufacturer had prior notice of the same defect from other consumers — powerful evidence of corporate knowledge and potentially of punitive conduct.

Medical records documenting the injury mechanism, the severity of harm, and the long-term prognosis are essential to establishing both causation and the full scope of economic and non-economic damages.