Strict Liability (Abnormally Dangerous Activities) vs. Products Liability (Strict Liability)
A detailed comparison of these two torts rules, including key differences, exam strategies, and guidance on when to apply each.
Overview
Both abnormally dangerous activity strict liability and products liability strict liability impose liability without fault, but they apply in entirely different contexts and have different analytical frameworks. Understanding the distinction is important for torts exams that test strict liability concepts.
Strict liability for abnormally dangerous activities, derived from Rylands v. Fletcher and codified in the Restatement (Second) of Torts Sections 519-520, holds a defendant liable for harm caused by engaging in an activity that is abnormally dangerous regardless of the care exercised. The Restatement factors include: the degree of risk, the likelihood of harm, the inability to eliminate risk through reasonable care, the extent to which the activity is not common in the area, the inappropriateness of the activity to the location, and the value of the activity to the community. Common examples include blasting, storing large quantities of explosives, and keeping wild animals.
Products liability strict liability, under Restatement (Second) Section 402A and the Restatement (Third), holds commercial sellers liable for selling defective products regardless of fault. The focus is on the product defect, not the activity of selling. The plaintiff must prove the product was defective (manufacturing defect, design defect, or failure to warn), the defect existed when it left the defendant's control, and the defect caused injury. This doctrine applies only to commercial sellers in the distribution chain.
The key conceptual difference is that abnormally dangerous activity liability focuses on the nature of the activity itself, while products liability focuses on the condition of a specific product. The former applies even when the product or activity functions perfectly; the latter requires a defect.
Key Differences
| Aspect | Strict Liability (Abnormally Dangerous Activities) | Products Liability (Strict Liability) |
|---|---|---|
| Focus | The nature of the activity (inherently dangerous) | The condition of the product (defective) |
| Defect required? | No; liability attaches even if activity is conducted perfectly | Yes; must prove the product was defective |
| Who is liable | Anyone engaged in the abnormally dangerous activity | Commercial sellers in the chain of distribution |
| Analytical framework | Restatement (Second) Sections 519-520 six-factor test | Restatement (Second) Section 402A or Restatement (Third) defect categories |
| Scope of liability | Liable for harms that are within the type of risk that makes the activity abnormally dangerous | Liable for harms caused by the product defect |
Exam Tips
On a torts exam, strict liability for abnormally dangerous activities and products liability strict liability are tested separately but can overlap. If a company manufactures explosives that detonate during storage (an abnormally dangerous activity), analyze both doctrines. For abnormally dangerous activities, apply the six-factor Restatement test to determine if the activity qualifies. For products liability, determine if the explosive was defective. The critical distinction: if the explosion occurred because the activity is inherently dangerous (not due to a product defect), only abnormally dangerous activity strict liability applies. If the explosion occurred due to a manufacturing defect in the explosive, products liability applies.
When to Apply Which
Apply abnormally dangerous activity strict liability when the defendant's activity itself creates an abnormal risk of harm, regardless of whether any product was defective. Apply products liability strict liability when a defective product caused harm. If the harm stems from the inherent danger of an activity, use the abnormally dangerous activity framework. If it stems from a flaw in a specific product, use products liability. Both doctrines can apply simultaneously in some fact patterns.