Product liability law holds manufacturers, distributors, and retailers accountable when a defective product causes injury, and the legal framework for these claims differs fundamentally from ordinary negligence in one important way: strict liability. Under strict product liability doctrine, which most states recognize for product defect cases, the injured person does not need to prove that the manufacturer was careless. They need to prove that the product was defective, that the defect existed when it left the manufacturer’s control, and that the defect caused the injury. The manufacturer’s conduct, their knowledge of the defect, and whether they exercised reasonable care in the design or manufacturing process are not elements the injured party must establish. The defect itself, combined with causation and damages, is sufficient to impose liability.
Manufacturing Defects: When the Specific Product Deviated From Its Design
A manufacturing defect occurs when the specific product that injured the plaintiff deviated from the manufacturer’s own design specifications and from the other units in the same production run. A car that rolled off the assembly line with an improperly installed brake component, a medical device that was contaminated during production, and a consumer appliance with a wiring error that was not present in other units of the same model all represent manufacturing defects. The legal analysis compares the specific product to the manufacturer’s intended design: if the product deviated from the design in a way that made it more dangerous, and that deviation caused the injury, the manufacturer is strictly liable regardless of how careful the manufacturing process was overall.
Design Defects: When Every Unit of the Product Is Dangerous
A design defect occurs when the product’s design itself is unreasonably dangerous, meaning that every unit produced according to the specifications poses the same risk. Design defect cases require establishing either that the product failed to perform as safely as an ordinary consumer would expect, the consumer expectations test, or that the risks of the design outweigh its benefits when compared to a reasonable alternative design that would have reduced the risk without eliminating the product’s utility, the risk-utility test. Many states apply one or both tests, and the available alternative design is typically the most important element of the risk-utility analysis: an expert who can demonstrate that a different design would have prevented the plaintiff’s specific injury without unacceptably degrading the product’s function provides the foundation for a viable design defect claim.
Failure to Warn: When the Danger Was Known but Not Disclosed
A failure to warn claim arises when a product has a risk that is not obvious to the ordinary user, when the manufacturer knew or should have known of that risk, and when an adequate warning would have prevented the injury. The pharmaceutical industry generates the largest volume of failure to warn litigation, but the theory applies across all product categories: power tools that pose specific risks in specific uses, chemical products whose interactions with other common household products create dangers, and consumer electronics that can cause injury in conditions that the product’s ordinary users routinely encounter. The adequacy of the warning is evaluated from the perspective of the ordinary user: a warning buried in fine print, written in technical language that non-expert users cannot parse, or placed in a location that users do not consult before using the product may be found legally insufficient even when it technically mentions the risk.
Expert Requirements in Product Liability Cases
Product liability claims require engineering or scientific expert testimony to establish the defect, the causal mechanism, and the existence of a reasonable alternative design. These cases are discovery-intensive and require access to the manufacturer’s design documents, testing records, complaint histories, and regulatory submissions. The Consumer Product Safety Commission’s product safety data provides the publicly accessible recall history and incident reports for consumer products, which often provide foundational evidence of the manufacturer’s prior knowledge of the defect. Working with attorneys who provide legal help for product liability cases gives seriously injured consumers access to the engineering expert network and the discovery infrastructure that product liability claims require.