Product liability claims let a person injured by a defective product recover money from the companies that designed, made, distributed, or sold it. You generally have to show the product was defective in its manufacture, its design, or its warnings; that the defect existed when it left the defendant’s control; and that it caused your injury. You do not have to prove the company was careless. The principle traces to the California Supreme Court’s 1963 decision in Greenman v. Yuba Power Products, which held a manufacturer strictly liable for injuries caused by a defective product, and every state has since adopted some version of the rule.1Justia. Greenman v Yuba Power Products, Inc
What Counts as a Defective Product
The law sorts defects into three categories, and the one that fits your situation controls what you have to prove.
A manufacturing defect is a flaw that occurred during production, so the specific unit that hurt you left the factory in a condition the maker never intended. Think of a contaminated batch of medication or a bicycle frame with a hairline crack from a bad weld. Usually only a fraction of the production run is affected. The question is whether your unit departed from the intended design.
A design defect is built into the blueprint, so every unit off the line carries the same hazard. Most jurisdictions ask whether a reasonable alternative design existed that would have reduced the foreseeable risk of harm without undermining the product’s usefulness. Proving this almost always requires expert engineering testimony, which is a major reason design cases get expensive.2Justia. Design Defects Supporting Products Liability Legal Claims
A warning or marketing defect arises when a product carries a non-obvious risk the manufacturer knew or should have known about but failed to communicate. The warning has to be specific enough to convey the actual danger and conspicuous enough that a user would notice it. A small caution buried deep in a manual for a tool with an amputation risk does not satisfy the duty.
These categories are not mutually exclusive. A single product can have both a design flaw and an inadequate warning, and plaintiffs regularly plead more than one theory in the same complaint.
Who You Can Sue
Anyone in the commercial chain of distribution can be named as a defendant. That includes the company that designed and assembled the finished product, suppliers of individual components, the wholesalers and distributors that moved it to market, and the retailer that sold it to you.3Cornell Law Institute. Products Liability If a lithium battery explodes inside a laptop, both the battery maker and the computer company may be on the hook.
Naming multiple defendants matters practically. One company may be insolvent, outside the court’s jurisdiction, or already dissolved. Casting a wider net improves the odds that a solvent defendant with insurance remains on the case when a judgment comes due.
How You Prove the Claim
A product liability lawsuit usually rests on one or more of three legal theories, and most complaints assert all three to maximize the chance of recovery.
Strict Liability
Strict liability focuses on the product, not the manufacturer’s conduct. You need to show the product was defective, the defect existed when it left the defendant’s control, and the defect caused your injury. The Greenman court put the policy plainly: companies that profit from selling products should bear the cost when those products injure people, rather than leaving consumers powerless to protect themselves.1Justia. Greenman v Yuba Power Products, Inc
Negligence
A negligence claim examines what the manufacturer actually did or failed to do. You must prove the company owed a duty of care to foreseeable users, breached that duty, and that the breach caused your injury. Negligence covers failures like inadequate quality-control testing, ignoring reports of prior injuries, substituting cheaper materials, or failing to update warnings after learning of a new hazard. The practical obstacle is that most evidence of internal decision-making only surfaces in discovery.
Breach of Warranty
Warranty claims arise under the Uniform Commercial Code, which every state has adopted in some form. An express warranty is created whenever a seller makes a specific promise about performance, describes the goods, or shows a sample that becomes part of the deal; the words “warranty” or “guarantee” are not required. An implied warranty of merchantability exists automatically whenever a merchant sells goods, meaning the product must be fit for its ordinary purpose and pass without objection in the trade.4Legal Information Institute. Uniform Commercial Code 2-314 – Implied Warranty Merchantability Usage of Trade A toaster that catches fire the first time you use it fails that standard without anyone having to prove negligence.
What You Can Recover
Damages fall into two broad categories, and the amounts can vary enormously with the severity of the injury and the manufacturer’s conduct.
Compensatory Damages
Compensatory damages reimburse your actual losses. Economic damages are the ones you can put a receipt on: past and future medical expenses, lost wages or business profits, property damage, and the cost of household help if a long-term disability keeps you from managing daily tasks. Medical expenses often make up the largest piece, and courts allow recovery for both treatment already received and the projected cost of future care. Lost wages include not just the paychecks missed during recovery but also diminished earning capacity if the injury permanently limits what you can do for a living.
Non-economic damages compensate for real losses that resist a dollar figure: physical pain, emotional distress, reduced quality of life, and loss of consortium, which covers the impact on your relationship with a spouse or family.
Punitive Damages
Punitive damages punish particularly egregious conduct and deter similar behavior elsewhere. They are not available in every case. Courts typically require proof the manufacturer acted with malice, fraud, or willful disregard for consumer safety. A company that discovered a lethal defect in internal testing and buried the results faces a much stronger punitive argument than one that missed a flaw despite reasonable quality control. Many states cap punitive damages as a multiple of compensatory damages, and the U.S. Supreme Court has signaled that ratios much beyond single digits raise constitutional concerns.
The Economic Loss Trap
One limitation catches many consumers off guard. If a defective product only damages itself and causes no physical injury to a person or damage to other property, most states bar a tort claim. A dishwasher that breaks down from a defective pump is a warranty problem, not a product liability case, and your remedy runs through contract law. But if that same defective pump causes the dishwasher to leak and ruin your kitchen floor, the damage to the floor is “other property,” and a tort claim opens up. The distinction matters most in commercial settings where the financial losses from a product failure can be substantial but the legal avenue stays limited to contract.
What the Other Side Will Argue
Manufacturers and their insurers have a well-developed playbook. Knowing the common defenses helps you see where your case may be vulnerable.
Comparative Fault
If your own conduct contributed to the injury, your recovery is likely to be reduced. Most states apportion responsibility as a percentage between you and the manufacturer. Under pure comparative fault, you can recover even if you were mostly responsible, though your award shrinks in proportion to your share. Under modified systems, crossing a threshold (usually 50 or 51 percent fault) bars recovery entirely. The defendant must put on evidence of your fault before a court will let the jury consider it.
Product Misuse
Defendants often argue the consumer used the product in an abnormal or unintended way. The defense works only when the misuse was genuinely unforeseeable. Courts take a broad view of what manufacturers should anticipate. Using a screwdriver to pry open a paint can may be technically a misuse, but it is entirely predictable. The defense gains traction with conduct that is truly outrageous, not just slightly off-label.
Assumption of Risk
This defense requires proof that you subjectively understood a specific danger and chose to encounter it anyway. General awareness that power tools are dangerous is not enough. The manufacturer must show you knew about the particular defect or hazard that caused your injury and used the product regardless. Courts also reject the defense when an employer required the worker to use the product, since the choice was not truly voluntary.
Learned Intermediary
When products reach consumers through professionals with specialized knowledge, the manufacturer may argue it had no duty to warn the end user directly. In pharmaceutical cases, for instance, the duty to warn often runs to the prescribing physician rather than the patient. The question is whether the intermediary actually possessed enough knowledge to serve as an adequate substitute for direct warnings.
How Long You Have to File
Missing a deadline destroys an otherwise strong claim, and product liability has two separate clocks that run independently.
The statute of limitations for product liability typically runs two to four years, depending on the state. Most states apply a discovery rule, which starts the clock when you discovered (or reasonably should have discovered) the injury and its connection to the product rather than the date the product was sold or even when the injury physically occurred. The discovery rule matters most for latent injuries from toxic exposures or defective medical implants, where symptoms may not surface for years.
About 19 states also impose a stricter deadline called a statute of repose. The repose clock starts from a fixed event, usually the date the product was first sold, and runs for a set number of years regardless of when the injury happens. If a state has a 10-year repose period and a defective industrial press injures a worker 12 years after purchase, the claim is dead on arrival even if the limitations period has not expired. Repose statutes give manufacturers eventual certainty against liability for aging products, and they can be a brutal barrier for anyone injured by older equipment.
What to Save Right Now
The single most important piece of evidence is the defective product itself. Store it somewhere secure. Do not attempt repairs, modifications, or testing on your own. If the product was destroyed in the incident, high-resolution photographs and video of the damage, along with any surviving fragments, become your best substitute.
Preserve the following:
- Proof of purchase: receipts, credit card statements, or order confirmations that establish when and where you bought the product.
- Medical records: emergency room records, surgical reports, specialist consultations, physical therapy notes, and pharmacy records. Request copies early, since retrieval fees and processing times add up.
- Packaging and instructions: the original box, warning labels, user manual, and any assembly tools that came with the product.
- Incident documentation: a written timeline, photographs of the scene, and contact information for any witnesses, created while details are still fresh.
Once litigation is reasonably anticipated, everyone involved has a legal duty to preserve relevant evidence. Destroying, altering, or losing it, even accidentally, can trigger sanctions ranging from fines to a jury instruction that the missing evidence would have been unfavorable, and in extreme cases outright dismissal. Plaintiffs who throw away the defective product hurt their own case. Treat everything related to the product and the incident as untouchable from the moment you consider filing a claim.
What Filing a Case Looks Like
A product liability lawsuit begins with a complaint filed in the appropriate court, which means choosing between federal and state court and identifying the right jurisdiction based on where the injury occurred or where the defendant does business. Filing fees vary by court and amount in dispute. After filing, the complaint must be formally served on each defendant. In federal court, a defendant has 21 days after service to file a responsive pleading.5United States Courts. Federal Rules of Civil Procedure State deadlines vary but generally fall in a similar range.
Discovery is where product liability cases are won or lost. Both sides exchange documents, take depositions, and retain expert witnesses. You will almost certainly need at least one expert, typically an engineer or materials scientist who can explain how the defect caused the failure and why a safer alternative existed. Expert opinions based on speculation or untested theories get excluded, and when that happens the claim often collapses because the technical link between defect and injury disappears.
When Many People Are Hurt by the Same Product
When a widely distributed product injures people across the country, dozens or hundreds of individual lawsuits may be filed in different federal courts. Under 28 U.S.C. ยง 1407, a special judicial panel can transfer those cases to a single federal court for consolidated pretrial proceedings, including discovery and motions.6Office of the Law Revision Counsel. 28 USC 1407 – Multidistrict Litigation This process, called multidistrict litigation, avoids duplicating the same expert depositions and document reviews in every district. The presiding judge often selects a handful of bellwether cases for early trial to help establish the value of claims and encourage settlement. Unlike a class action, each plaintiff in an MDL keeps their own attorney and must individually prove the defect caused their particular injuries. Cases that do not settle go back to their original courts for trial.
Checking for a Recall
A recall by the Consumer Product Safety Commission does not automatically prove your case, but it can be powerful supporting evidence that the manufacturer knew about the hazard. You can report a dangerous product and search existing complaints at SaferProducts.gov, the CPSC’s public database.7CPSC. Recalls and Product Safety Warnings Checking whether the product has already been recalled is one of the first things any attorney will do when evaluating a potential claim, because a recall notice often contains the manufacturer’s own description of the defect and the injuries it has caused.