American consumers purchase millions of products every day with a reasonable expectation that those products have been designed and manufactured safely. When that expectation is violated — when a product causes injury because it was defectively designed, improperly manufactured, or sold without adequate warnings — the manufacturers and sellers responsible can be held legally accountable under product liability law. Understanding how these claims work helps injured consumers understand their rights and the legal pathways available to them.
The Strict Liability Revolution in Product Liability
Product liability law underwent a fundamental transformation in the 1960s when courts adopted strict liability as the standard for defective product claims. Before strict liability, an injured consumer had to prove that the manufacturer was negligent — that they failed to exercise reasonable care in designing or making the product. This was enormously difficult, because manufacturers controlled all the information about their design and manufacturing processes, and proving internal negligence required access to records and witnesses that consumers could not obtain without litigation.
Strict liability eliminated the need to prove negligence. Under strict liability, a manufacturer is liable for injuries caused by a defective product regardless of whether they exercised all reasonable care in its design and production. If the product was defective when it left the manufacturer’s control and the defect caused the plaintiff’s injury, liability follows. This shift was deliberate and reflects a policy judgment that manufacturers — who profit from selling products and who are best positioned to test, design, and build them safely — should bear the cost of injuries caused by product failures rather than placing that burden on injured consumers who had no role in the product’s creation.
Design Defects: When the Blueprint Is the Problem
A design defect exists when the entire product line is unreasonably dangerous because of how it was designed, not because of any error in making a particular unit. Every unit coming off the production line has the same defect because the defect is baked into the design specification. Courts use several tests to evaluate design defect claims. The consumer expectations test asks whether the product failed to perform as safely as an ordinary consumer would reasonably expect given the product’s intended uses. The risk-utility test asks whether the risks of the design outweigh its utility — whether the benefits of the design choice justify the danger it creates, and whether an alternative design that was safer, economically feasible, and commercially viable was available. Common design defect claims involve vehicles with stability problems, power tools without adequate guards, medications whose side effect profiles outweigh their therapeutic benefits, and consumer electronics with overheating or fire risks.
Manufacturing Defects: When Production Goes Wrong
A manufacturing defect involves a specific unit that departed from the intended design during the production process — the design is sound, but something went wrong in making this particular item. A structural component machined to incorrect tolerances, a medication batch with incorrect active ingredient concentration, a safety harness with a stitching error that causes it to fail under load — these are manufacturing defects that affect specific units while the design itself is acceptable. Proving a manufacturing defect requires showing what the product was supposed to be like and demonstrating that the specific product that injured you deviated from that specification. Physical examination of the product by an engineering expert is essential.
Preserving the Product: The Single Most Important First Step
The defective product itself is your most critical piece of evidence. It must be preserved in the exact condition it was in at the time of the injury — not repaired, not returned to the manufacturer, not cleaned, and not modified in any way. Document its condition thoroughly with photographs immediately after the injury. Keep all packaging, instructions, warning labels, and receipts. If the manufacturer contacts you offering to take the product back for inspection, do not agree without first consulting an attorney and ensuring that any such inspection happens under mutually agreed conditions that preserve your ability to use the product in subsequent litigation. Products that have been returned to manufacturers have a way of being repaired or disappearing, and the evidentiary loss is irreplaceable.