UBE Strict Liability
Last updated: May 2, 2026
Strict Liability questions are one of the highest-leverage areas to study for the UBE. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.
The rule
Strict liability imposes responsibility for harm without fault, but only in three classic categories: (1) injuries caused by wild animals or by domestic animals with known dangerous propensities, (2) harm caused by abnormally dangerous activities, and (3) products liability (treated separately). Under the Restatement (Second) of Torts §§ 519–520, a defendant who carries on an abnormally dangerous activity is strictly liable for harm to person or property resulting from the activity, even with utmost care. Liability is capped by the scope-of-risk doctrine: the harm must flow from the kind of danger that made the activity abnormally dangerous in the first place, and the plaintiff must be a foreseeable plaintiff.
Elements breakdown
Wild Animals
An owner or possessor of a wild animal is strictly liable for harm caused by the animal that results from a dangerous propensity characteristic of wild animals of that class.
- Defendant owned or possessed the animal
- Animal belongs to a wild (non-domesticated) species
- Harm resulted from a dangerous propensity typical of the species
- Plaintiff was not a trespasser on defendant's land
Common examples:
- Privately kept tiger that mauls a lawful visitor
- Pet bear that crushes a guest while playing
- Captive venomous snake that bites a contractor
Domestic Animals with Known Dangerous Propensities
A keeper of a domestic animal is strictly liable for harm caused by a known abnormal dangerous propensity of that specific animal.
- Animal is of a domesticated species
- Animal had a specific dangerous propensity abnormal to its class
- Defendant knew or had reason to know of that propensity
- Harm resulted from that known propensity
Common examples:
- Dog that previously bit a delivery worker and bites again
- Horse known to kick people in stalls
- Bull that has charged farmhands twice before
Trespassing Livestock
An owner of livestock is strictly liable for reasonably foreseeable property damage caused when the livestock trespass onto the land of another.
- Defendant owned livestock (cattle, sheep, etc.)
- Livestock intruded onto plaintiff's land
- Harm to land or chattels was foreseeable from such intrusion
- Damage occurred during the trespass
Abnormally Dangerous Activities (Restatement (Second) §§ 519–520)
One who carries on an abnormally dangerous activity is strictly liable for harm to person, land, or chattels resulting from the activity, even if exercising the utmost care to prevent the harm.
- Activity creates a foreseeable, highly significant risk of harm
- Risk cannot be eliminated by reasonable care
- Activity is not a matter of common usage in the community
- Activity is inappropriate to the place where carried on
- Activity's value to community is outweighed by its dangerous attributes
- Harm flowed from the kind of risk that makes the activity abnormally dangerous
Common examples:
- Blasting and use of high explosives
- Storage of large quantities of flammable liquids or toxic chemicals in a populated area
- Crop dusting with toxic pesticides
- Fumigation with poison gas
- Transporting hazardous waste through a residential area
Scope-of-Risk Limitation
Strict liability extends only to harm of the type whose risk made the activity abnormally dangerous and only to foreseeable plaintiffs within the zone of that risk.
- Harm must be of the type the activity's danger threatens
- Plaintiff must be a foreseeable victim within the risk zone
- Unforeseeable intervening causes may cut off liability
- Fully unrelated harms are not recoverable in strict liability
Defenses to Strict Liability
Traditional negligence is no defense, but assumption of risk and (in comparative-fault jurisdictions) comparative responsibility may reduce or bar recovery.
- Knowing and voluntary assumption of the specific risk bars recovery
- Contributory negligence is generally NOT a defense at common law
- Comparative fault reduces recovery in most modern jurisdictions
- Plaintiff's abnormally sensitive activity may defeat causation
Common patterns and traps
The Care-Is-No-Defense Trap
The fact pattern emphasizes the defendant's elaborate safety precautions—licensed blaster, modern equipment, conformity with industry standards. A negligence-trained candidate concludes the defendant wins because there was no breach. In strict liability, this is a category error: precautions are irrelevant to liability, only relevant to damages-mitigation arguments or to whether the activity even qualifies as abnormally dangerous in the first place.
A wrong choice reads: 'No, because the defendant complied with all applicable safety regulations and exercised the highest degree of care.'
The Scope-of-Risk Cut
The defendant engages in an obviously abnormally dangerous activity, but the plaintiff's harm is causally connected only by an idiosyncratic chain—a frightened animal bolts, a startled person falls down stairs, a bystander has a panic attack. The Restatement § 519(2) limit blocks recovery: strict liability extends only to harm whose risk made the activity dangerous (debris, fire, toxic exposure), not every downstream consequence.
A wrong choice reads: 'Yes, because the defendant's blasting was the but-for cause of the plaintiff's injury.'
The Domestic-vs-Wild Misclassification
Bar examiners exploit borderline species: large dogs, bulls, exotic-but-domesticated breeds. A wild animal triggers automatic strict liability for species-typical dangers; a domestic animal triggers strict liability only on proof of a known abnormal propensity in the specific animal. Mislabeling the category flips the answer.
A wrong choice reads: 'Yes, because the owner of any large or aggressive animal is strictly liable for injuries it causes.'
The Common-Usage Escape
Activities common in the community—driving cars, using residential gas appliances, ordinary farming with non-toxic methods—fall outside § 520 even when occasionally dangerous. Candidates over-extend strict liability to any 'risky' activity. The § 520 multi-factor test, especially the common-usage and appropriate-location factors, exists to keep ordinary modern life out of strict liability.
A wrong choice reads: 'Yes, because operating heavy machinery near a residential area is an abnormally dangerous activity.'
The Trespasser-Plaintiff Bar
Strict liability for kept animals generally does not extend to trespassers who are bitten or attacked while unlawfully on the defendant's land—they must rely on negligence or intentional-tort theory. Examiners drop a trespass fact (climbing a fence, ignoring posted signs) into an animal vignette to test whether the candidate notices.
A wrong choice reads: 'Yes, because owners of wild animals are strictly liable to anyone the animal injures, regardless of where the injury occurs.'
How it works
Picture Reyes Blasting Co. detonating dynamite to clear a foundation in a populated neighborhood. Even with state-of-the-art precautions, blasting creates a residual risk of flying debris and concussive force that no amount of care can fully eliminate—classic abnormally dangerous activity under §§ 519–520. If a shard of rock pierces the window of a neighboring home and injures Patel, Reyes is strictly liable; Patel need not prove negligence, and Reyes cannot escape by showing it followed every industry protocol. But suppose instead that Patel's pet ostrich, startled by the blast, kicks Patel in the chest. That harm—startled-bird kick—is not the kind of risk (debris, vibration, concussion) that makes blasting abnormally dangerous, so the scope-of-risk doctrine cuts off strict liability. Patel would have to fall back on negligence. The same scope-of-risk filter operates with wild animals: a zoo's escaped tiger that mauls a jogger triggers strict liability, but a tiger that gives someone a heart attack from mere fright presents a harder, fact-bound question of whether the harm flowed from the dangerous propensity.
Worked examples
Will Patel prevail on her strict liability claim?
- A No, because Liu Demolition complied with all applicable regulations and used industry-best precautions.
- B No, because the harm—a cut from flying glass—is too remote from the blasting to satisfy proximate cause.
- C Yes, because blasting in a populated area is an abnormally dangerous activity and Patel's injury flowed from the very risk that makes it dangerous. ✓ Correct
- D Yes, because Liu Demolition is vicariously liable for any injuries caused by its licensed blaster, regardless of the activity's nature.
Why C is correct: Blasting is the paradigm Restatement (Second) § 520 abnormally dangerous activity—high risk of physical harm, risk unavoidable by reasonable care, inappropriate to a populated district. Patel's injury came from flying debris, exactly the kind of risk that makes blasting dangerous, so the scope-of-risk limit is satisfied. Compliance with regulations is not a defense to strict liability under § 519(1).
Why each wrong choice fails:
- A: This invokes negligence reasoning—reasonable care is no defense to strict liability under § 519(1). The whole point of the doctrine is that liability attaches even when the defendant exercises utmost care, precisely because the residual risk cannot be eliminated. (The Care-Is-No-Defense Trap)
- B: Flying debris from a blast is the quintessential risk that makes blasting abnormally dangerous; it is squarely within the scope-of-risk under § 519(2), not too remote. Confusing 'remoteness' with the geographic distance of the fragment misreads the doctrine. (The Scope-of-Risk Cut)
- D: Vicarious liability is a separate doctrine and is not the basis for liability here. Strict liability for abnormally dangerous activities attaches directly to the principal who carries on the activity, regardless of whether the actual blaster was an employee or independent contractor.
Will Chen most likely prevail on his strict liability claim?
- A Yes, because owners of wild animals are strictly liable for any injuries caused by the animal, regardless of where the injury occurs.
- B Yes, because Reyes's posted warning sign acknowledges the dangerous propensity and triggers strict liability.
- C No, because Chen was a trespasser at the time of injury, and strict liability for kept wild animals generally does not extend to trespassers. ✓ Correct
- D No, because Reyes complied with the local registration ordinance and acted reasonably in fencing the animal.
Why C is correct: Under the Restatement (Second), strict liability for harm caused by a kept wild animal generally does not extend to trespassers; a trespasser injured by the animal must proceed in negligence or under an intentional-tort theory. Chen scaled the fence and ignored a clear warning sign, making him a trespasser at the moment of injury, so strict liability is unavailable.
Why each wrong choice fails:
- A: This overstates the rule. Strict liability for wild animals has a built-in trespasser limitation; it does not run to 'anyone the animal injures, regardless of where.' This is exactly the kind of overbroad statement the trespasser-bar pattern targets. (The Trespasser-Plaintiff Bar)
- B: Posting a warning does not expand strict liability—if anything, it bolsters the assumption-of-risk and trespasser defenses. The warning is evidence of Reyes's care, not a concession that defeats the trespasser limitation.
- D: Reasonable care and ordinance compliance are no defense to strict liability for a wild animal—§ 519(1) makes utmost care irrelevant to the existence of liability. The correct reason Reyes wins is the trespasser limitation, not the quality of his precautions. (The Care-Is-No-Defense Trap)
Will Liu prevail on her strict liability claim?
- A Yes, because aerial crop-dusting is an abnormally dangerous activity and Patel's plane was the but-for cause of Liu's injury.
- B Yes, because as a foreseeable bystander on a public road, Liu falls within the class of persons protected by strict liability rules.
- C No, because Patel exercised reasonable care in conducting the aerial application.
- D No, because Liu's injury did not result from the kind of risk—toxic chemical exposure—that makes crop-dusting abnormally dangerous. ✓ Correct
Why D is correct: Restatement (Second) § 519(2) limits strict liability to harm that flows from the dangerous propensity that makes the activity abnormally dangerous. Aerial crop-dusting is dangerous because of toxic drift and chemical exposure, not because of engine noise. Liu's injury, caused by a startled horse rather than chemical contact, falls outside the scope of risk, so strict liability does not attach—she must proceed, if at all, in ordinary negligence.
Why each wrong choice fails:
- A: But-for causation alone is not enough for strict liability; the harm must also fall within the scope of the risk that makes the activity abnormally dangerous. This choice ignores the § 519(2) limitation entirely. (The Scope-of-Risk Cut)
- B: Foreseeability of the plaintiff is necessary but not sufficient—the harm itself must still match the kind of risk that triggered strict liability. Liu's status as a foreseeable bystander does not cure the scope-of-risk mismatch between toxic exposure and a noise-startled horse. (The Scope-of-Risk Cut)
- C: Reasonable care is irrelevant to strict liability under § 519(1). Even if true, this reasoning would not defeat a properly framed strict liability claim; the correct ground for denying recovery is scope-of-risk, not the defendant's level of care. (The Care-Is-No-Defense Trap)
Memory aid
"WAD-P" — Wild animals, Abnormally dangerous activities, Domestic animals with known propensity, Products. For § 520, remember the six factors as "R-R-C-I-V-K": Risk high, Risk unavoidable by care, Common usage (no), Inappropriate location, Value outweighed, Kind of harm matches the risk.
Key distinction
The single sharpest line is care versus scope: a defendant cannot escape strict liability by proving reasonable care, but CAN escape by showing the harm fell outside the kind of risk that triggered strict liability in the first place. Candidates who pick "defendant exercised due care" as the right answer have walked into the central trap.
Summary
Strict liability attaches to wild animals, known-dangerous domestic animals, and abnormally dangerous activities, but only for harm flowing from the very risk that made the conduct dangerous—reasonable care is no defense, yet scope of risk is.
Practice strict liability adaptively
Reading the rule is the start. Working UBE-format questions on this sub-topic with adaptive selection, watching your mastery score climb in real time, and seeing the items you missed return on a spaced-repetition schedule — that's where score lift actually happens. Free for seven days. No credit card required.
Start your free 7-day trialFrequently asked questions
What is strict liability on the UBE?
Strict liability imposes responsibility for harm without fault, but only in three classic categories: (1) injuries caused by wild animals or by domestic animals with known dangerous propensities, (2) harm caused by abnormally dangerous activities, and (3) products liability (treated separately). Under the Restatement (Second) of Torts §§ 519–520, a defendant who carries on an abnormally dangerous activity is strictly liable for harm to person or property resulting from the activity, even with utmost care. Liability is capped by the scope-of-risk doctrine: the harm must flow from the kind of danger that made the activity abnormally dangerous in the first place, and the plaintiff must be a foreseeable plaintiff.
How do I practice strict liability questions?
The fastest way to improve on strict liability is targeted, adaptive practice — working questions that focus on your specific weak spots within this sub-topic, getting immediate feedback, and revisiting items you missed on a spaced-repetition schedule. Neureto's adaptive engine does this automatically across the UBE; start a free 7-day trial to see your sub-topic mastery climb in real time.
What's the most important distinction to remember for strict liability?
The single sharpest line is care versus scope: a defendant cannot escape strict liability by proving reasonable care, but CAN escape by showing the harm fell outside the kind of risk that triggered strict liability in the first place. Candidates who pick "defendant exercised due care" as the right answer have walked into the central trap.
Is there a memory aid for strict liability questions?
"WAD-P" — Wild animals, Abnormally dangerous activities, Domestic animals with known propensity, Products. For § 520, remember the six factors as "R-R-C-I-V-K": Risk high, Risk unavoidable by care, Common usage (no), Inappropriate location, Value outweighed, Kind of harm matches the risk.
What's a common trap on strict liability questions?
Confusing strict liability with negligence per se
What's a common trap on strict liability questions?
Missing the scope-of-risk filter on causation
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