What is the per se rule of negligence?
Asked by: Marcelle Lakin | Last update: February 22, 2026Score: 4.6/5 (48 votes)
The negligence per se rule simplifies proving negligence in personal injury cases by making a defendant automatically considered negligent (breached their duty) if they violate a safety statute or regulation that causes the type of harm the law was designed to prevent, to a person the law was meant to protect, eliminating the need to prove the standard of care. Instead, the plaintiff only needs to prove the statutory violation, causation, and damages, with common examples being traffic violations like speeding or running a red light.
What is the rule of negligence per se?
Negligence per se means negligence in itself. In a tort case, a defendant who violates a statute or regulation without an excuse is automatically considered to have breached their duty of care and is therefore negligent as a matter of law.
What does per se law mean?
In law, per se (Latin for "by itself") means something is inherently wrong, illegal, or considered a violation on its own, without needing proof of additional harm, intent, or circumstances, simplifying prosecution; common examples include certain antitrust violations like price-fixing or driving with a BAC over the legal limit (DWI per se).
How to prove negligence per se?
Under normal circumstances, a plaintiff bringing a negligence claim must prove: (1) the defendant had a duty to the plaintiff; (2) the defendant breached that duty; and the breach of this duty (3) proximally caused (4) damages.
What two things must be true of a law before the doctrine of negligence per se can apply?
For negligence per se to apply, the victim must be within the class of persons the law was meant to protect. Relatedly, the law must have been meant to prevent the type of accident that injured the victim.
Negligence in Tort Law: Res Ipsa Loquitur and Negligence Per Se
What four things must be proven for negligence?
Most civil lawsuits for injuries allege the wrongdoer was negligent. To win in a negligence lawsuit, the victim must establish 4 elements: (1) the wrongdoer owed a duty to the victim, (2) the wrongdoer breached the duty, (3) the breach caused the injury (4) the victim suffered damages.
What does per se mean in law?
In law, per se (Latin for "by itself") means something is inherently wrong, illegal, or considered a violation on its own, without needing proof of additional harm, intent, or circumstances, simplifying prosecution; common examples include certain antitrust violations like price-fixing or driving with a BAC over the legal limit (DWI per se).
Who decides if negligence per se occurred?
This means the court presumes the defendant was negligent, but the defendant gets a chance to present evidence to prove they were acting reasonably under the circumstances. Evidence of Negligence: The violation is simply one piece of evidence for the jury to consider when determining if the party was negligent.
What defenses exist against negligence per se?
Negligence Per Se Defenses
- The defendant violated a regulation or statute enacted by a jurisdiction.
- The statute or regulation was created to protect a class of people from a specific harm.
- The plaintiff was in the class protected by the law.
How difficult is it to prove negligence?
Proving negligence may require detailed evidence and expert testimony, especially in cases involving multiple factors contributing to the plaintiff's injuries. A knowledgeable personal injury attorney will know how to prepare a strong case on your behalf.
What is illegal per se?
In US law, the term illegal per se means that the act is inherently illegal. Thus, an act is illegal without extrinsic proof of any surrounding circumstances such as lack of scienter (knowledge) or other defenses. Acts are made illegal per se by statute, constitution or case law.
How do I use per se correctly?
Use per se (pronounced "purr say") to mean "in itself," "by itself," or "intrinsically," often to single out one aspect of something while distinguishing it from other factors or contexts, typically in a negative statement followed by a contrasting "but" clause, like, "The job isn't bad per se, but the commute is terrible". It clarifies that something isn't the inherent problem, but rather something connected to it.
What are the four types of slander per se?
4 Categories for Defamation Per Se
- Accusing someone of a serious criminal offense.
- Accusing someone of having an infectious disease.
- Accusing someone of conduct incompatible with the person's business, trade, position or office.
- Accusing a woman of a lack of chastity.
What are the 4 types of negligence?
While there are various ways to categorize negligence, four common types often discussed in personal injury law are Ordinary Negligence, Gross Negligence, Contributory Negligence/Comparative Negligence, and Vicarious Negligence, each defining different levels of fault or responsibility for causing harm. Ordinary negligence is a simple failure of care, while gross negligence involves reckless disregard, contributory/comparative deals with shared fault, and vicarious negligence holds one party responsible for another's actions.
What is an illegal per se law?
The term "per se" is a Latin phrase that translates to "by itself" or "in itself." In legal contexts, it refers to actions or conduct that are considered inherently wrong or illegal without needing further examination or proof of harm.
What is the difference between negligence per se and evidence of negligence?
The key difference is that negligence per se involves a violation of a specific law or regulation, which is automatically considered negligent, whereas other negligence cases may require proof of a breach of duty without reference to a specific legal standard.
What is the burden of proof for negligence per se?
In cases involving regular negligence, the burden of proof is on the plaintiff to show that the actions or inactions of the defendant were a negligent breach of their duty of care. In cases involving negligence per se, the violation of law is automatically proof that the defendant breached their duty of care.
What are the 4 proofs of negligence?
The existence of a legal duty to the plaintiff; The defendant breached that duty; The plaintiff was injured; and, The defendant's breach of duty caused the injury.
What is an excuse for negligence per se?
Exceptions to Negligence Per Se
The person has some form of physical disability or incapacitation, making the violation reasonable. The person exercised reasonable care in trying to comply, but was still unable to comply with the statute.
What 5 failed areas must be proven by the plaintiff to win a negligence case?
Negligence is a term frequently encountered in personal injury law. To establish negligence in a legal context, five key elements must be proven: duty of care, breach of duty, causation, proximate cause, and damages.
What four elements must be proved in a negligence suit?
To prove negligence in court, a plaintiff must establish four key elements: Duty of Care (the defendant owed a legal duty to the plaintiff), Breach of Duty (the defendant failed to meet that duty), Causation (the breach directly caused the injury), and Damages (the plaintiff suffered actual harm or loss). Without proving all four, a negligence claim will likely fail.
What evidence is needed to prove negligence?
To prove negligence, you must show the four elements: duty (defendant owed you a duty of care), breach (they failed that duty), causation (their breach caused your injury), and damages (you suffered actual harm/losses). Evidence includes medical records, expert testimony, photos/videos, police reports, eyewitness accounts, and financial records to link the negligent act to your specific injuries and losses.
What is an example of negligence per se?
A very common and easily-understood example of negligence per se is when a speeding driver strikes a pedestrian with his vehicle. By speeding, the driver is breaking a safety-related law designed to protect people like pedestrians from the type of accident that occurred.
Why do people misuse per se?
The similar phrases in itself and in and of itself can be used to mean the same thing. Perhaps due to its Latin origin and somewhat abstract meaning, per se is often misused. Let's look at some examples that demonstrate proper use. Most often, per se is used in sentences that seek to avoid a generalization.
What is a per se violation?
Latin for “by itself,” in other words, inherently. For example, in tort law, a statutory violation is negligence per se. One of the elements a person has to prove in a negligence claim is that the defendant breached their duty owed. There is a duty to obey the law bound up in the duty to act non-negligently.