California Bar Strict Liability
Last updated: May 2, 2026
Strict Liability questions are one of the highest-leverage areas to study for the California Bar. 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 tort liability without proof of fault when the defendant engages in a category of conduct the law treats as inherently risky: (1) keeping certain animals, (2) conducting an abnormally dangerous activity, or (3) commercially supplying a defective product. The plaintiff must still prove actual cause, proximate cause, and damages, and the harm must flow from the kind of risk that made the activity strict-liability-worthy in the first place (the 'scope-of-risk' or 'normally dangerous propensity' limitation). Governing sources: Restatement (Second) of Torts §§519-520, 522 (abnormally dangerous activities); §§507-509 (animals); Restatement (Third) of Torts: Products Liability §§1-2; for products, California follows Greenman/Cronin/Barker design-defect doctrine and applies a consumer-expectations OR risk-utility test (defendant's choice of test depending on complexity).
Elements breakdown
Strict Liability for Wild Animals
An owner or possessor of a wild animal is strictly liable for harm caused by the animal's dangerous propensities characteristic of its kind, even with utmost care.
- Defendant owned or possessed the animal
- Animal is wild (not domesticated by custom)
- Harm resulted from a dangerous propensity typical of the species
- Plaintiff was not a trespasser on defendant's land
Common examples:
- Tigers, bears, wolves, venomous snakes
- Monkeys and primates kept as pets
- A circus elephant on private grounds
Strict Liability for Domestic Animals with Known Vicious Propensity
An owner of a domestic animal is strictly liable only if the owner knew or had reason to know of the animal's dangerous propensities abnormal to its class.
- Animal is domestic (dog, cat, horse, livestock)
- Animal had a dangerous propensity abnormal to its class
- Owner knew or had reason to know of that propensity
- Harm resulted from that specific propensity
Common examples:
- Dog with a prior bite history (the 'one-bite' rule outside California)
- Horse known to kick
- California: Civil Code §3342 imposes statutory strict liability for dog bites regardless of prior knowledge
Trespassing Livestock
An owner of livestock or other animals likely to roam is strictly liable for reasonably foreseeable property damage caused by their trespass.
- Defendant owned or possessed livestock
- Animals trespassed onto plaintiff's land
- Damage was foreseeable from the trespass
- Damage is the kind ordinarily caused by such animals
Common examples:
- Cattle straying onto a neighbor's crops
- Sheep damaging a vegetable garden
Abnormally Dangerous Activity
One who carries on an abnormally dangerous activity is strictly liable for resulting harm even with utmost care, if the harm flows from the risk that made the activity dangerous.
- Activity creates a foreseeable and highly significant risk of harm
- Risk cannot be eliminated by reasonable care
- Activity is not one of common usage in the community
- Harm resulted from the kind of risk that made the activity dangerous
Common examples:
- Blasting and use of explosives
- Storing large quantities of flammable liquids or toxic chemicals in populated areas
- Crop dusting with toxic pesticides
- Fumigation with cyanide gas
- Transport of hazardous waste
Products Liability — Manufacturing Defect
A commercial seller is strictly liable when a product departs from its intended design and that defect causes physical harm to a foreseeable user or bystander.
- Defendant is a commercial seller in the chain of distribution
- Product had a manufacturing defect when it left defendant's control
- Defect made the product unreasonably dangerous
- Defect caused plaintiff's injury (actual and proximate cause)
- Plaintiff was a foreseeable user, consumer, or bystander
Common examples:
- A single soda bottle that explodes due to faulty bottling
- A car with a defective brake assembly that escaped quality control
Products Liability — Design Defect
A commercial seller is strictly liable when the product's design itself is unreasonably dangerous; California applies a consumer-expectations test or, for complex products, a risk-utility test.
- Defendant is a commercial seller
- Product's design was defective when it left defendant's control
- Under consumer-expectations test: product failed to perform as safely as ordinary consumer would expect; OR under Barker risk-utility test: risks of design outweigh benefits
- Defect caused plaintiff's injury
- Plaintiff was a foreseeable user or bystander
Common examples:
- Vehicle prone to rollover at highway speeds
- Power tool without a feasible safety guard
- California Barker v. Lull Engineering (1978): plaintiff may invoke either test
Products Liability — Failure to Warn
A commercial seller is strictly liable for failing to warn of foreseeable, non-obvious risks of which the seller knew or should have known.
- Defendant is a commercial seller
- Product had a foreseeable, non-obvious risk
- Defendant knew or reasonably should have known of the risk
- Defendant failed to provide an adequate warning
- Failure caused plaintiff's injury
Common examples:
- Pharmaceutical with a known but unwarned side effect
- Power equipment without warnings about kickback
- Learned-intermediary doctrine for prescription drugs
Common patterns and traps
The Scope-of-Risk Trip-Up
The defendant clearly engages in an abnormally dangerous activity or keeps a wild animal, but the plaintiff's injury arises from a tangential risk (a slip-and-fall at a blasting site, a heart attack from being startled by a caged tiger). Bar examiners love this because candidates see the trigger word ('blasting,' 'tiger,' 'explosives') and pick strict liability without checking whether the harm matches the characteristic danger. The rule under Restatement §519(2) limits strict liability to the kind of harm that made the activity abnormally dangerous.
A choice that says 'Strictly liable, because [defendant] was engaged in [blasting/keeping wild animal]' without addressing whether the injury flowed from concussive force, flying debris, or the wild-animal propensity.
The Casual Seller Trap
Products strict liability requires a commercial seller — someone in the business of selling products of that kind. A neighbor selling a used appliance at a yard sale, an individual reselling a car on Craigslist, or a service provider who only incidentally supplies a product (a hairdresser using shampoo) is not a 'commercial seller' for §402A purposes. The trap distractor frames a one-off transaction as triggering strict products liability.
A choice that says 'Strictly liable, because [non-commercial defendant] sold a defective product' — ignoring the commercial-seller threshold.
The California-vs-MBE Dog Switch
Under the majority/MBE rule, owners of domestic dogs are strictly liable only after the first bite (knowledge of vicious propensity). California Civil Code §3342 abolishes this — the owner is strictly liable for dog bites in any place the victim is lawfully present, regardless of prior knowledge. On California essays, apply §3342; on MBE-style questions tagged majority rule, apply the one-bite rule. Mis-applying the wrong jurisdiction's rule is a classic graders'-checkbox loss.
Two choices that differ only in whether the owner's prior knowledge of viciousness is required — one wrong-jurisdiction, one right.
The Common-Usage Defense Hidden in Plain Sight
An activity that is common in the community is not abnormally dangerous, even if dangerous. Driving a car, using natural gas, transmitting electricity through ordinary residential lines — courts treat these as common usage, defeating strict liability and pushing analysis to negligence. Candidates miss this when they see 'dangerous' without checking whether the activity is everyday.
A choice asserting strict liability for an everyday activity (gasoline storage in a residential garage, ordinary driving), ignoring that common-usage defeats the §520 factor.
The Comparative Fault Misfire
Most jurisdictions, including California, apply comparative fault to strict liability claims (Daly v. General Motors Corp., 1978). The trap distractor either says comparative fault is unavailable in strict liability (old/repealed rule) or that assumption of risk is a complete bar (often is, but only knowing/voluntary). Candidates relying on outdated treatises pick the absolute-bar choice.
A choice that says 'Plaintiff cannot recover, because comparative negligence does not apply to strict liability' — applying the pre-Daly rule.
How it works
Think of strict liability as a category sort, not a fault analysis. Step one: does the defendant's conduct fall within a strict-liability silo (wild animal, abnormally dangerous activity, defective product)? Step two: did the harm flow from the kind of risk the silo targets? A blasting company is strictly liable when debris shatters a window — but if a workman trips over a fuse and breaks his ankle, that harm isn't from the abnormal-danger characteristic (concussive force, flying debris) and ordinary negligence rules apply. Same logic with animals: if Liu's pet tiger escapes and mauls a neighbor, strict liability; if the same tiger startles a delivery driver who falls down stairs, courts split, but the cleanest answer is that fright/startle harms still flow from the wild-animal propensity. For products, focus on whether the defendant is a commercial seller (casual sellers are out), whether the defect existed when it left the defendant's control, and whether the plaintiff is a foreseeable user, consumer, or bystander — privity is not required.
Worked examples
Which plaintiff is most likely to recover under strict liability?
- A Both Patel and Liu, because blasting is an abnormally dangerous activity and Reyes is strictly liable for all resulting harm.
- B Only Patel, because his harm flowed from the concussive force that makes blasting abnormally dangerous, while Liu's injury did not flow from that characteristic risk. ✓ Correct
- C Only Liu, because his injury was a direct foreseeable consequence of the blast.
- D Neither, because Reyes followed all safety protocols and obtained the required permits.
Why B is correct: Blasting is the paradigmatic abnormally dangerous activity under Restatement §520. But §519(2) limits strict liability to harm that flows from the characteristic risk — here, the concussive force and flying debris. Patel's shattered windows fit squarely. Liu's broken toes resulted from being startled and dropping a hammer, a tangential harm not within the scope of risk that makes blasting abnormally dangerous; his claim, if any, is in negligence.
Why each wrong choice fails:
- A: This treats strict liability as absolute liability, ignoring the scope-of-risk limitation in Restatement §519(2). Not all harm 'caused by' an abnormally dangerous activity triggers strict liability — only harm flowing from the characteristic danger. (The Scope-of-Risk Trip-Up)
- C: While Liu's injury was foreseeable in a but-for sense, foreseeability alone does not satisfy the scope-of-risk requirement. The harm must flow from the kind of risk that made blasting abnormally dangerous (concussive force, debris), not from a startled-bystander injury. (The Scope-of-Risk Trip-Up)
- D: Strict liability does not turn on whether the defendant exercised reasonable care or complied with safety regulations. The whole point of §519 strict liability is that it attaches even when the activity is conducted with utmost care.
Will the parents most likely prevail on a strict liability theory under California law?
- A No, because Max had no prior bite history and Patel had no knowledge of any vicious propensity.
- B No, because the parents must prove negligence in failing to control Max.
- C Yes, because California Civil Code §3342 imposes strict liability on dog owners for bites occurring where the victim is lawfully present, regardless of the owner's knowledge of viciousness. ✓ Correct
- D Yes, because keeping any dog in a residential complex is an abnormally dangerous activity.
Why C is correct: California Civil Code §3342 imposes strict liability on dog owners for bites that occur in any public place or where the victim is lawfully on private property, without requiring proof of the owner's prior knowledge of viciousness. The child was lawfully visiting his mother (a tenant), Max bit him, and Patel as the keeper is liable. California rejects the common-law 'one-bite' rule for dog bites by statute.
Why each wrong choice fails:
- A: This applies the majority/MBE common-law 'one-bite' rule (knowledge of vicious propensity required). California's §3342 displaces that rule for dog bites — prior knowledge is irrelevant. Picking this choice means applying the wrong jurisdiction's rule on a California Bar question. (The California-vs-MBE Dog Switch)
- B: Negligence is a separate theory; strict liability under §3342 does not require any showing of unreasonable conduct. The statute creates a no-fault cause of action specifically to spare bite victims from having to prove negligence.
- D: Keeping an ordinary domestic dog is not an abnormally dangerous activity under §520; dogs are kept by millions of households (common usage) and the risk is not extreme enough. The correct doctrinal hook here is the §3342 statute, not §520 abnormally-dangerous-activity strict liability. (The Common-Usage Defense Hidden in Plain Sight)
Will Reyes most likely prevail against Patel on a strict products liability theory?
- A Yes, because the mower had a manufacturing defect that existed when it left the factory and caused Reyes's injury.
- B Yes, because Patel sold the mower to Reyes and is in the chain of distribution.
- C No, because Patel is not a commercial seller of products of this kind, so strict products liability does not apply. ✓ Correct
- D No, because Reyes assumed the risk by purchasing a six-year-old used mower.
Why C is correct: Strict products liability under Restatement (Second) §402A and Restatement (Third) §1 applies only to commercial sellers — those engaged in the business of selling products of the kind in question. Patel is a casual seller (one yard-sale transaction by a private individual not in the lawn-equipment business). Reyes can pursue the manufacturer (and possibly the original retail chain) on a strict liability theory, but not Patel. Reyes's only viable theory against Patel would be ordinary negligence, which would require proving Patel knew or should have known of the defect.
Why each wrong choice fails:
- A: This correctly identifies a manufacturing defect but applies strict liability to the wrong defendant. The defect existed when it left the factory, but liability runs against the commercial sellers in the original chain, not against a private individual reselling the product years later. (The Casual Seller Trap)
- B: Mere participation in a sale does not put a defendant in the 'chain of distribution' for §402A purposes. The chain consists of commercial sellers — manufacturer, distributor, retailer — not casual private resellers. (The Casual Seller Trap)
- D: Assumption of risk requires a knowing and voluntary encounter with a known specific risk. Reyes had no reason to know about a defective factory weld inside the blade housing. Buying a used product does not constitute assumption of every latent defect risk, and in California comparative fault (not absolute bar) applies post-Daly anyway. (The Comparative Fault Misfire)
Memory aid
Three silos: ANIMALS, ACTIVITIES, ARTIFACTS. For activities, the §520 factors collapse to 'High-Risk, Uncontrollable, Uncommon' — HRUU. For products, the chain runs MAN-DIST-RET (manufacturer-distributor-retailer), all commercial sellers are jointly strictly liable.
Key distinction
Strict liability ≠ absolute liability. The harm must flow from the very risk that made the activity, animal, or product dangerous in the first place — the scope-of-risk limitation. A trespassing plaintiff or a harm outside the characteristic risk breaks the chain even when every formal element is met.
Summary
Strict liability attaches without fault for wild/known-vicious animals, abnormally dangerous activities, and defective products sold by commercial sellers — but only when the harm flows from the characteristic risk and the plaintiff proves causation and damages.
Practice strict liability adaptively
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Start your free 7-day trialFrequently asked questions
What is strict liability on the California Bar?
Strict liability imposes tort liability without proof of fault when the defendant engages in a category of conduct the law treats as inherently risky: (1) keeping certain animals, (2) conducting an abnormally dangerous activity, or (3) commercially supplying a defective product. The plaintiff must still prove actual cause, proximate cause, and damages, and the harm must flow from the kind of risk that made the activity strict-liability-worthy in the first place (the 'scope-of-risk' or 'normally dangerous propensity' limitation). Governing sources: Restatement (Second) of Torts §§519-520, 522 (abnormally dangerous activities); §§507-509 (animals); Restatement (Third) of Torts: Products Liability §§1-2; for products, California follows Greenman/Cronin/Barker design-defect doctrine and applies a consumer-expectations OR risk-utility test (defendant's choice of test depending on complexity).
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 California Bar; 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?
Strict liability ≠ absolute liability. The harm must flow from the very risk that made the activity, animal, or product dangerous in the first place — the scope-of-risk limitation. A trespassing plaintiff or a harm outside the characteristic risk breaks the chain even when every formal element is met.
Is there a memory aid for strict liability questions?
Three silos: ANIMALS, ACTIVITIES, ARTIFACTS. For activities, the §520 factors collapse to 'High-Risk, Uncontrollable, Uncommon' — HRUU. For products, the chain runs MAN-DIST-RET (manufacturer-distributor-retailer), all commercial sellers are jointly strictly liable.
What's a common trap on strict liability questions?
Treating strict liability as fault-free recovery — plaintiff still must prove causation and scope-of-risk
What's a common trap on strict liability questions?
Applying products strict liability against a casual seller (neighbor selling a used lawnmower)
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