Proving breach: statutes, custom and res ipsa

Statutes as Breach Standards: The Protected Class and the Injury Type

A statute, regulation, or ordinance can supply the breach standard when it specifically requires conduct designed to prevent a particular kind of harm to a particular class of people. The doctrine is negligence per se: an unexcused statutory violation establishes breach, rather than merely serving as one item of evidence about reasonable conduct.

Run the doctrine in this order:

1. Identify a specific legal command. The enactment must prescribe concrete conduct or a concrete safety requirement. A general licensing, recordkeeping, or administrative provision usually does not itself establish the civil standard of care.

2. Identify the protected class. The plaintiff must belong to the class the enactment was designed to protect. Protection of pedestrians does not automatically make every injured motorist a protected plaintiff; protection of construction workers does not automatically cover every person injured near a construction site.

3. Identify the protected type of injury. The injury must be the kind of harm the enactment was designed to prevent. The injury need not occur through the exact mechanism legislators imagined, but it must fall within the statute’s safety purpose. A statute aimed at preventing fires may cover burn injuries even if the fire began in an unusual way; it does not necessarily cover an unrelated economic loss.

4. Find a violation. The defendant must have failed to do what the enactment required or done what it prohibited.

5. Ask whether the violation was excused. Recognized excuses can include incapacity, inability to comply despite reasonable diligence, an emergency not caused by the defendant’s own conduct, lack of knowledge of the occasion for compliance despite reasonable care, or compliance that would create a greater risk of harm.

If all these conditions are met, the violation establishes breach under negligence per se. It does not automatically establish causation, injury, or damages. The plaintiff still must connect the violation to the injury and prove the remaining negligence requirements.

A statute need not create a private right of action for its violation to matter in a negligence case. Negligence per se uses the statute to establish breach; it is not itself a claim for statutory damages. But a court may decline to use negligence per se when the statute’s purpose, remedial scheme, or enforcement structure shows that civil negligence consequences were not intended.

The key near miss is failure of the protected-class or protected-injury requirement. If the plaintiff is outside the protected class, or the injury is outside the protected type, the violation does not establish breach under negligence per se. It may still be relevant evidence of unreasonable conduct if it bears on the ordinary-care inquiry. That is a weaker use.

Defensive use follows the same analysis. A defendant may argue that the plaintiff violated a safety statute and thereby breached a duty to people in the statute’s protected class who suffered the statute’s protected injury. If the plaintiff fits both categories and the violation was unexcused, the plaintiff’s statutory violation may establish the plaintiff’s breach. The effect of that breach on the plaintiff’s recovery is a comparative-fault question, not a reason to ignore the statute.

If the statute does not fit negligence per se, the defendant can still argue that the plaintiff’s violation is circumstantial evidence that the plaintiff acted unreasonably. But a regulatory violation aimed at licensing, revenue collection, or administrative order usually has little or no relevance to whether the plaintiff took reasonable precautions against this injury.

The same distinction applies when a defendant invokes a statute defensively. Compliance with a statute is not a conclusive defense to negligence. A statute commonly sets a minimum safety floor; an actor may still need additional precautions when the foreseeable risk requires them. Conversely, violation of a statute is not automatically negligence per se merely because the statute uses mandatory language.

This is closed-book: be able to state the negligence-per-se requirements, the protected-class and protected-injury limits, and the consequence of an unexcused violation without supplied authority.

Custom and Proof: What the Factfinder May Infer

Custom is evidence, not the rule of decision. Evidence that actors in an industry commonly take a precaution may support the defendant’s claim that the conduct was reasonable. Evidence that the defendant departed from the custom may support the plaintiff’s claim that the conduct was careless. Neither conclusion is automatic.

The factfinder should ask whether the custom is sensible in light of the particular risk, the seriousness and likelihood of harm, the burden of precautions, and the available alternatives. Those are the ordinary breach considerations; custom informs them but does not replace them. A whole industry may follow an unsafe practice, so industry-wide compliance does not conclusively establish due care. Conversely, a defendant’s departure from custom may be reasonable when the customary precaution does not fit the unusual facts.

The closest distinctions are these:

• Custom versus statutory command: Custom describes what actors commonly do. A statute prescribes what the law requires. Custom cannot excuse an unexcused violation that qualifies as negligence per se, and statutory compliance does not necessarily end the ordinary-care inquiry.

• Custom versus professional standard: A professional practice may be powerful evidence in a professional-negligence dispute, but the professional-standard issues belong to the separate reasonable-person and professional-standard material. For this chapter, the essential point is that common practice is not automatically the legal minimum.

• Custom versus res ipsa: Custom supplies evidence about precautions ordinarily taken. Res ipsa supplies a permitted inference from an unusual event and the defendant’s control of the instrumentality. A plaintiff may use both, but neither is required merely because the other is unavailable.

Direct and circumstantial evidence are methods of proving what happened, not different substantive standards of negligence.

Direct evidence describes conduct perceived firsthand or shown without inferential steps: an eyewitness sees a driver text while operating a vehicle, a recording shows a worker remove a guard, or a defendant admits failing to inspect equipment. Direct evidence still depends on credibility, accuracy, and context.

Circumstantial evidence consists of facts from which the factfinder reasonably infers conduct or fault: a safety guard is missing immediately after the defendant’s maintenance work, a fresh tire mark shows a vehicle’s path, or a required inspection log is blank while the equipment fails in the precise way an inspection would have revealed. Circumstantial evidence can be as persuasive as direct evidence. The plaintiff does not lose merely because no witness saw the negligent act.

The limit is reasoned inference. The factfinder may choose a reasonable inference supported by the surrounding facts, but may not stack speculation on speculation. “The accident could have resulted from defendant’s negligence” is not enough when equally plausible nonnegligent explanations remain unsupported. Proof that makes negligent conduct more reasonably inferable is different from proof that merely leaves negligence possible.

Res ipsa is a specialized form of circumstantial reasoning. Ordinary circumstantial evidence asks the factfinder to infer a particular negligent act from facts such as timing, physical conditions, or admissions. Res ipsa allows an inference of negligence even when the plaintiff cannot identify the exact careless act, but only after its special conditions are satisfied.

Res Ipsa Inference: Control Without an Eyewitness

Res ipsa loquitur means that the occurrence itself permits an inference of negligence. It does not mean that the defendant is automatically liable, and it does not mean that the plaintiff wins whenever an accident is unexplained.

The usual analysis has two core conditions:

1. The incident is of a type that ordinarily does not occur absent negligence. The question concerns the kind of incident, not whether every occurrence of the injury proves negligence. A properly functioning sealed bottle does not ordinarily explode without some negligent manufacture, handling, or inspection; that kind of event may support res ipsa. A person’s ordinary fall, by contrast, may occur without anyone’s negligence, so the fall alone usually does not establish the first condition.

2. The instrumentality causing the incident was under the defendant’s exclusive control. “Exclusive control” is a legal and practical requirement, not necessarily literal possession at the instant of injury. The relevant inquiry is whether the defendant controlled the instrumentality at the likely time the negligent condition arose and whether other responsible causes have been sufficiently excluded.

The incident must not be due to any voluntary action or contribution by the plaintiff. Likewise, if an independent third party had a substantial opportunity to create the dangerous condition, exclusive control or the required elimination of other responsible causes may be missing. The plaintiff need not eliminate every imaginable cause; the alternative must be reasonably plausible on the facts.

Control can survive a change in possession when the instrumentality probably became defective while still under the defendant’s responsibility and was not substantially altered afterward. For example, a sealed product may support the inference even though the consumer held it when it failed, if the evidence shows that no meaningful later handling caused the condition. By contrast, an object passed among several independent handlers before the incident usually presents a control problem.

Control may also be adequate where several people acted as part of one responsible operation and the evidence narrows the possible negligent actors to that operation. But merely naming a defendant who was somewhere in the chain is not enough. If an independent person could have created the condition and the facts do not distinguish that person’s conduct, res ipsa may fail even though ordinary circumstantial evidence remains available.

If the conditions are met, the consequence is limited and precise: the plaintiff may ask the factfinder to infer that the defendant was negligent. The factfinder may reject the inference, and the inference does not ordinarily shift the ultimate burden of proving the case. The plaintiff still must show that the instrumentality caused the injury and must prove the injury and damages.

The near-miss distinctions are especially important:

• Unexplained accident versus res ipsa: An unexplained injury is not enough. The event must be one that ordinarily does not happen absent negligence.

• Exclusive control versus possession at injury: The defendant need not hold the instrumentality at the exact moment of harm, but the facts must support control when the negligent condition likely arose.

• Circumstantial evidence versus res ipsa: Circumstantial evidence may prove a specific careless act. Res ipsa is the narrower inference available when the event itself, plus control, supports negligence without identifying that act.

• Permitted inference versus automatic liability: Res ipsa gets the issue to the factfinder; it does not compel a finding for the plaintiff.

Loading diagram…

A state safety statute requires every contractor to secure hand tools on elevated platforms when pedestrians may pass below. The statute is designed to protect pedestrians from falling-object injuries.

Contractor D knowingly leaves a wrench unsecured on a platform above a public sidewalk. Nothing prevents D from securing it. A subcontractor and a delivery company had handled the wrench earlier that day. An eyewitness sees D’s employee leave the wrench unsecured; the wrench later falls and injures P, a pedestrian.

The industry’s customary practice is to secure tools only when winds exceed a specified speed. The statute does not expressly authorize a private damages action.

Three Narrow Tests: Statute, Custom and Inference

High-Yield Points - ⚡ Biggest Takeaways

Negligence per se requires an unexcused violation, protected plaintiff class, and protected injury type. Custom informs breach but never automatically sets the legal standard. Circumstantial proof can establish fault; res ipsa permits inference only after its conditions are shown. Exclusive control concerns when negligence likely arose, not necessarily when injury occurred.