Strict Liability: Liability Without Fault

In most tort cases, a plaintiff must prove that the defendant acted negligently or intentionally. Strict liability is different. Under this doctrine, a defendant can be held liable for harm regardless of fault, intent, or the level of care exercised. The policy rationale is straightforward: certain activities and products carry inherent risks, and those who engage in those activities or place those products into the stream of commerce should bear the cost of any resulting injuries. Understanding strict liability is critical for the torts section of the CP exam and for paralegals working in personal injury or product liability litigation.

Abnormally Dangerous Activities

The Restatement (Second) of Torts, Section 519, imposes strict liability on anyone who carries on an abnormally dangerous activity that causes harm, even if they exercised the utmost care. The Restatement identifies several factors courts consider when determining whether an activity is abnormally dangerous:

Whether the activity involves a high degree of risk of harm to persons, land, or property
Whether the harm that results is likely to be serious
Whether the risk cannot be eliminated by the exercise of reasonable care
Whether the activity is not a matter of common usage
Whether the activity is inappropriate for the location where it is carried on
The extent to which the value of the activity to the community is outweighed by its risks

Classic examples include blasting with explosives, storing large quantities of flammable or toxic materials, and using nuclear energy. Everyday activities like driving a car or operating a factory, however dangerous they may be in practice, are generally not considered abnormally dangerous because they are matters of common usage.

Product Liability Under Strict Liability

The most common application of strict liability in modern law involves defective products. Under the Restatement (Third) of Torts: Products Liability, a manufacturer, distributor, or retailer can be held strictly liable for harm caused by a defective product. Three types of product defects give rise to strict liability:

Manufacturing Defects: The product departs from its intended design due to an error in the manufacturing process. Only the defective unit is flawed; other units are fine.
Design Defects: The entire product line is inherently dangerous because of its design. Courts typically apply either the consumer expectations test or the risk-utility balancing test.
Warning Defects (Failure to Warn): The product lacks adequate warnings or instructions about known risks associated with its use.

Animal Owner Liability

Strict liability has long applied to owners of wild animals. If you keep a wild animal (such as a tiger, bear, or venomous snake) and it injures someone, you are strictly liable regardless of the precautions you took. For domestic animals, strict liability applies only if the owner knew or had reason to know of the animal's dangerous propensities. This is sometimes called the "one-bite rule," although the name is somewhat misleading because any prior indication of dangerousness (not necessarily a prior bite) can trigger liability.

Defenses to Strict Liability

Although strict liability does not require proof of fault, defendants are not entirely without defenses. Depending on the jurisdiction, potential defenses include:

Assumption of Risk: The plaintiff knowingly and voluntarily encountered the risk that caused the harm
Comparative Fault: In jurisdictions that apply comparative fault principles to strict liability, the plaintiff's own negligence may reduce recovery
Product Misuse: The plaintiff used the product in an unforeseeable manner not intended by the manufacturer
Statute of Limitations / Statute of Repose: The claim was not filed within the applicable time period

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Strict Liability in Tort Law: When Fault Does Not Matter