3.1 Negligence and Legal Liability

Why Legal Liability Drives Casualty Insurance

Casualty insurance (also called liability insurance) protects the insured against the financial consequences of being held legally responsible for injuring another person or damaging their property. Unlike property insurance, which pays for the insured's own losses, liability insurance pays a third party on the insured's behalf. Before any liability policy responds, the insured must first be legally liable — meaning a court could compel them to pay. That liability almost always arises from a tort, a civil wrong (other than breach of contract) for which the law provides a remedy.

The most common tort, and the one most exam questions revolve around, is negligence.

The Four Elements of Negligence

To win a negligence claim, the plaintiff (injured party) must prove all four of the following elements by a preponderance of the evidence. If even one is missing, the claim fails.

Proximate cause is the element most often tested as a distinction: it is not simply any cause, but the cause that sets off an unbroken chain of events leading to the loss, where the harm was a foreseeable result. An intervening cause can break this chain and relieve the defendant of liability.

Types of Damages

When liability is established, the court awards damages. Liability insurers pay compensatory damages but generally do not pay punitive damages.

• Compensatory damages — restore the injured party ("make them whole"). Two sub-types:
  • Special damages — economic, measurable losses: medical bills, lost wages, repair costs.
  • General damages — non-economic losses that are harder to quantify: pain and suffering, disfigurement, loss of consortium.
• Punitive (exemplary) damages — punish the wrongdoer for willful, malicious, or grossly negligent conduct and deter others. Many states (and most insurers) treat punitive damages as uninsurable as a matter of public policy.

Common Defenses to Negligence

A defendant can reduce or eliminate liability using recognized defenses:

• Contributory negligence — in a few jurisdictions, if the plaintiff is even 1% at fault, they recover nothing (a complete bar).
• Comparative negligence — damages are reduced by the plaintiff's percentage of fault. Under pure comparative negligence the plaintiff can recover even if 99% at fault; under modified comparative negligence recovery is barred once the plaintiff reaches 50% or 51% fault, depending on the state.
• Assumption of risk — the plaintiff knowingly and voluntarily accepted a known danger (e.g., a spectator at a baseball game).

Liability Without Negligence, and Coverage Triggers

Some liability does not require proof of fault at all.

• Absolute / strict liability — imposed regardless of fault for inherently dangerous activities (blasting, keeping wild animals) and many product liability cases. The plaintiff need not prove the defendant was careless.
• Vicarious liability — one party is held responsible for the negligent acts of another, such as an employer for an employee acting within the scope of employment (respondeat superior), or a vehicle owner for a permissive driver.
• Intentional torts — deliberate acts such as assault, battery, libel, or slander. Liability policies almost universally exclude intentional acts because insuring deliberate harm violates public policy and removes the element of fortuity.

Occurrence vs. Claims-Made

Liability policies differ in what triggers coverage:

• Occurrence — covers injury or damage that takes place during the policy period, no matter how many years later the claim is reported.
• Claims-made — covers a claim only if it is first made during the policy period (subject to a retroactive date), regardless of when the injury occurred.

This trigger distinction is central to professional and product liability coverage and is revisited in the CGL section.

The Standard of Care and "Reasonable Person"

The standard of care the defendant is measured against is that of the hypothetical reasonably prudent person acting under similar circumstances. The standard rises for those with special skills: a physician is held to the standard of a competent physician, not an average layperson. Certain people owe a higher duty — common carriers (airlines, buses) owe passengers the highest degree of care, while property owners owe different duties to invitees, licensees, and trespassers.

Res Ipsa Loquitur and Negligence Per Se

Two doctrines ease the plaintiff's burden of proving breach:

• Res ipsa loquitur ("the thing speaks for itself") — negligence is inferred because the harm ordinarily would not occur without negligence and the instrumentality was in the defendant's exclusive control (e.g., a surgical sponge left inside a patient).
• Negligence per se — violation of a safety statute designed to protect the public (such as running a red light) is treated as automatic breach of duty.

Understanding these doctrines explains why liability insurers price casualty coverage around the frequency and severity of the legal exposures a given insured faces.