Strict liability changes the plaintiff’s burden, but it does not eliminate the need for careful tort analysis.
In an ordinary negligence action, the plaintiff must prove that the defendant failed to exercise reasonable care. Strict liability removes that particular requirement in defined categories. The plaintiff may recover even when the defendant exercised substantial care if the doctrine applies and the defendant’s activity, animal, or defective product caused the type of injury for which strict liability is imposed.
Common Trap
Do not write that strict liability means the defendant is automatically liable because a dangerous product or activity caused injury. Strict liability eliminates the need to prove ordinary negligence; it does NOT eliminate the requirements of defect/activity, causation, scope of risk, harm, and defenses.
This chapter addresses two major strict-liability areas: (1) Animals and abnormally dangerous activities, and (2) Defective products.
Products Liability Requires Careful Classification:
- Manufacturing Defect: Did this particular unit depart from the intended design?
- Design Defect: Was the product line unreasonably dangerous even when manufactured exactly as intended?
- Warning Defect: Should foreseeable, nonobvious risks have been communicated through adequate instructions or warnings?
I The Strict-Liability Framework
A complete strict-liability analysis should proceed in sequence:
II Strict Liability for Animals
Animal cases require the student to distinguish wild animals from domestic animals. The rules differ because possession of a wild animal itself ordinarily creates a level of abnormal danger that justifies strict responsibility.
Wild Animals
A possessor of a wild animal is strictly liable for harm resulting from dangerous characteristics typical of that animal (e.g., lions, bears, venomous snakes). The defendant’s reasonable care ordinarily does not defeat strict liability.
Scope of the Animal Risk: The injury must arise from the type of danger that justifies strict liability. A venomous snake’s bite qualifies. Tripping over an ordinary shipping box containing a safely confined snake does not; ordinary negligence principles govern.
Domestic Animals
Domestic animals (dogs, cats, horses, cattle) generally fall under negligence principles UNLESS the owner knows or has reason to know that the particular animal possesses a dangerous tendency abnormal for its category.
This is traditionally called the "one-bite rule," but that label is misleading. A dog does not literally need to bite someone once. Knowledge can arise from repeated aggressive lunging, snapping, or special restraint practices. The dangerous tendency must also be relevant to the injury (e.g., knowing a horse kicks people from behind).
III Abnormally Dangerous Activities
Strict liability applies to activities whose serious risks remain significant even when reasonable care is exercised.
Traditional Factors Include:
- High degree of risk.
- Likelihood that resulting harm will be severe.
- Inability to eliminate the risk through reasonable care.
- Extent to which the activity is uncommon.
- Inappropriateness of the activity to the location.
- Community value outweighed by dangerous attributes.
If careful conduct can reduce a risk to an ordinary level (like driving a car), negligence law is adequate. Strict liability becomes appropriate when substantial danger remains despite reasonable precautions (like blasting with explosives).
Scope of the Abnormal Risk: Strict liability extends ONLY to the kind of harm that makes the activity abnormally dangerous. If a truck carrying explosives rear-ends a car at a red light (no explosion), it is an ordinary driving risk, and negligence principles provide the more natural theory.
IV Products Liability Overview
Products cases may support several theories: Strict products liability, Negligence, Breach of express/implied warranty, and Misrepresentation. Students should analyze each potentially applicable theory separately.
Strict Products Liability requires that a commercial supplier sold a defective product, the defect existed when it left their control, it reached the user without substantial alteration, and it caused legally cognizable harm. Potential defendants include manufacturers, wholesalers, distributors, and retailers. Casual sellers (like selling a mower at a garage sale) are excluded.
V Types of Defects
1. Manufacturing Defects
Occurs when a particular product departs from its intended design (e.g., a missing safety bolt). Compare this unit against the manufacturer's own specifications. Differs from negligent manufacture because strict liability applies even if quality control was flawless.
2. Design Defects
Affects the entire product line. Courts use either the Consumer-Expectation Test (is it more dangerous than an ordinary consumer would reasonably expect?) or the Risk-Utility Test (do the dangers outweigh the benefits, considering feasibility/cost of alternatives).
3. Warning Defects
Lacks adequate instructions/warnings for foreseeable, nonobvious risks. Warnings aren't required for obvious dangers (like a knife cutting). Plaintiff must prove warning causation (that they would have read/heeded an adequate warning).
Learned Intermediary Doctrine
For certain prescription medical products, the manufacturer may satisfy its warning obligation by adequately warning the prescribing medical professional rather than communicating every risk directly to the patient. The doctor serves as an intermediary.
VI Foreseeable Misuse & Alteration
A manufacturer must account for reasonably foreseeable misuse (e.g., knowing users routinely stand on the lower support bar of a ladder). However, they are not liable for bizarre or totally unforeseeable misuse (e.g., using a blender as a construction tool).
Substantial Alteration: Strict liability ordinarily requires that the product reach the user without a substantial relevant alteration. A substantial post-sale change cuts off liability if the alteration materially changed the product, contributed to the injury, and was not reasonably foreseeable (e.g., removing a safety guard after purchase).
VII Defenses, Economic Loss, & Warranty
Strict liability does not eliminate defenses. Defenses include comparative responsibility, assumption of risk, product misuse, and substantial alteration. A plaintiff who knowingly and voluntarily reaches into a moving machine with a broken guard may face assumption of risk defenses.
The Economic-Loss Rule
Products-liability tort law focuses on personal injury and damage to property other than the defective product itself. Pure commercial loss (e.g., a machine breaks down and costs the business $100k in lost profits, but no one is hurt) belongs to contract and warranty law.
Products Liability and Warranty
Products cases frequently overlap with Contracts. Potential theories include:
- Express Warranty: Factual promises or descriptions forming part of the bargain.
- Implied Warranty of Merchantability: Goods sold by a merchant must be fit for ordinary purposes.
- Implied Warranty of Fitness for a Particular Purpose: Seller knows the buyer's special purpose and knows the buyer relies on their judgment.
Chapter Summary
Strict liability does not mean absolute liability. Possessors of wild animals are strictly liable for harm resulting from dangerous characteristics typical of the animal. Domestic animals require knowledge of an abnormal dangerous tendency (the "one-bite rule").
Abnormally dangerous activities trigger strict liability when they create a high risk of severe harm that reasonable care cannot eliminate, the activity is uncommon, and the location is inappropriate. Strict liability extends ONLY to the type of harm that makes the activity abnormally dangerous.
Strict products liability applies to commercial sellers for defective products. A manufacturing defect departs from intended design. A design defect concerns the whole product line, evaluated via consumer expectations, risk-utility balancing, or a reasonable alternative design test. A warning defect involves a failure to warn of foreseeable, nonobvious risks.
Manufacturers must anticipate foreseeable misuse but are shielded by substantial unforeseeable alterations. The economic-loss rule directs pure commercial loss (no physical injury) toward contract and warranty law.
Interactive Issue Spotter
Navigate the doctrinal branches of Strict & Products Liability.
Practice Quiz (30 Questions)
Comprehensive Exam-Prep for Strict & Products Liability.
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Master Chapter 6's core terminology.
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