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Breach of Duty in Pennsylvania and New Jersey Tort Law

Breach of duty means that the person or company responsible for your injury failed to act the way a reasonably careful person would have acted under the circumstances. It is not enough that someone caused an accident—their conduct must have fallen short of what the law expects. If a driver ran a red light and struck your vehicle, that driver breached their duty to drive safely. If a property owner ignored a known hazard that caused you to fall, that is a breach. Establishing breach is one of the key steps in proving a personal injury claim.
Negligence per se applies when the person who injured you violated a law or regulation that was designed to protect people like you from harm. Common examples include traffic law violations, building code violations, or violations of safety regulations at a worksite. When negligence per se applies, you generally do not need to argue about whether the conduct was reasonable—the violation of the law establishes breach for you. This can significantly strengthen your case and simplify what needs to be proven at trial.
Res ipsa loquitur is a Latin phrase meaning “the thing speaks for itself.” It applies in situations where the accident itself is strong evidence that someone was negligent, even if you cannot identify exactly what went wrong. For example, if a surgical instrument is found inside a patient’s body after surgery, or a commercial elevator suddenly free-falls, or a large object falls from a building onto a pedestrian below, these are the kinds of events that simply do not happen unless someone was careless. Res ipsa loquitur allows a jury to infer negligence from the circumstances without requiring you to pinpoint the exact mistake.
For res ipsa loquitur to apply, three elements must generally be met: First, the accident must be of a type that ordinarily does not happen without negligence. Second, the thing that caused your injury must have been under the defendant’s control. Third, you must not have contributed to the accident yourself. When these elements are present, a jury is permitted to infer that the defendant was negligent even without direct proof of what they did wrong.
No. Res ipsa loquitur creates an inference of negligence—it allows the jury to conclude the defendant was negligent, but it does not require them to reach that conclusion. The defendant can still offer evidence to explain what happened and show they were not careless. Additionally, you still need to prove that the negligence caused your injuries and resulted in damages. Res ipsa loquitur helps establish one element of your case—breach of duty—but you still need to prove the complete case.
Yes, in some circumstances. New Jersey courts have been particularly willing to apply res ipsa loquitur even when multiple defendants may have had control over the instrumentality that caused the harm. In such cases, the doctrine can shift the burden to all defendants to explain why they were not responsible. This prevents defendants from escaping liability simply by pointing fingers at each other while you, the injured party, cannot determine which defendant caused your injury.
It depends on the type of case. In many professional negligence cases—such as medical malpractice or complex construction accidents—expert testimony is required to explain what the standard of care was and how the defendant fell short of it. However, in cases involving obvious conduct like running a stop sign or ignoring a clearly visible hazard, an expert may not be necessary. When negligence per se or res ipsa loquitur applies, the need for expert testimony on breach may be reduced or eliminated. An experienced personal injury attorney can evaluate what your specific case requires.
Both states recognize res ipsa loquitur and apply similar three-element tests, but there are meaningful differences. Pennsylvania treats res ipsa as creating a permissible inference of negligence—the jury may find negligence but is not required to. New Jersey has sometimes described res ipsa as creating a presumption, which can provide somewhat more procedural protection for plaintiffs. New Jersey courts have also been more flexible in applying the exclusive control requirement when multiple defendants may be responsible. The applicable law depends on where your injury occurred, and an attorney familiar with both jurisdictions can ensure the right legal standards are applied.
Possibly, yes. This is precisely where res ipsa loquitur becomes important. If the circumstances of your injury strongly suggest negligence—even if you cannot prove the specific act or omission—a court may allow a jury to infer that the defendant was negligent. You still need to show that the accident is the type that does not ordinarily happen without carelessness, and that the responsible party had control over whatever caused the harm. A thorough investigation by your attorney can help determine whether this doctrine applies to your situation.