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How Can You Prove Liability in a Personal Injury Case?

Goldberg, Goldberg & Maloney April 15, 2025

Personal injury law relies on establishing negligence or fault, and understanding how to prove liability is a critical part of the process. This article will help you understand the key elements involved in proving liability in a personal injury case and the steps you can take to strengthen your claim.

The Basics of Negligence & How to Prove It Led to Injury

Negligence refers to a situation where one party fails to act with reasonable care, leading to harm or injury to another party. In a personal injury case, the injured party (plaintiff) must prove that the defendant (the party being sued) was negligent, which caused the plaintiff’s injury.

To successfully prove liability in a personal injury case, certain elements must be demonstrated. These elements are:

  1. Duty of care: The defendant had a legal obligation to act in a certain way to avoid causing harm to others. For example, a driver has a duty to follow traffic laws and drive safely to prevent accidents. Similarly, property owners have a duty to maintain safe conditions on their premises.

  2. Breach of duty: The defendant violated their duty of care. This means showing that the defendant's actions or failure to act were unreasonable or careless. For instance, a business owner who fails to fix a known hazard, such as a wet floor, breaches their duty to keep the premises safe for customers.

  3. Causation: The defendant's breach of duty directly caused the injury. It’s important to establish that the defendant’s actions (or lack of action) were the proximate cause of your injury, not an unrelated event or circumstance.

  4. Damages: You must prove that the injury caused you actual harm, whether physical, emotional, or financial. Medical records, bills, and testimony from medical professionals can help demonstrate the extent of your injuries and how they’ve impacted your life.

Each of these elements plays a vital role in proving liability in a personal injury case. At Goldberg, Goldberg & Maloney, we work with our clients to confirm that we can clearly demonstrate each of these points to make the strongest case possible.

Gathering Evidence to Prove Liability

In any personal injury case, the evidence is key. Without strong evidence to support your claims, it becomes much harder to prove liability. To successfully prove liability, the plaintiff needs to present compelling evidence showing that the defendant’s actions or failure to act led directly to the injury.

There are many types of evidence that can be useful in proving liability in a personal injury case. However, what’s most important is gathering the right type of evidence that aligns with the specific circumstances of the case. Some common types of evidence that may be used to prove liability include:

1. Eyewitness Testimony

Eyewitnesses can play a critical role in personal injury cases. If there were people who witnessed the incident, their testimony can be used to support your version of events. 

Eyewitnesses can testify about what they saw, heard, or experienced, which helps to confirm that the defendant’s actions or negligence caused the injury. The more witnesses who can support your story, the stronger your case will be.

In a car accident, for example, a witness who saw another driver run a red light can testify to help prove the driver’s negligence. In a slip-and-fall case, a customer who saw the spill on the floor and observed the property owner’s failure to clean it up may provide vital evidence to show the owner’s breach of duty.

2. Photographs and Videos

Visual evidence can be one of the most powerful tools in proving liability. Photos and videos can provide a clear picture of what happened before, during, and after the incident. If you’ve been injured, taking photographs of the accident scene, your injuries, and any other relevant details can help illustrate the conditions that led to your injury.

For example, in a slip-and-fall case, photographs of the wet floor or broken sidewalk where you fell can demonstrate the hazardous condition that caused the accident. If there were any safety violations or other factors contributing to the accident, photos and videos can help highlight these issues.

3. Accident Reports

In many cases, an accident report is filed by law enforcement, an employer, or a property owner. 

These reports often contain key information, including a description of the accident, the parties involved, and any relevant details about the circumstances. An accident report can be a valuable piece of evidence to prove liability, especially if it supports your version of events.

For example, if police officers are called to the scene of a car accident, they will typically complete a report that includes their findings. This report can serve as a key document to prove the other driver’s fault, especially if they issued a citation for reckless driving or failure to obey traffic laws.

4. Medical Records

Medical records are essential in personal injury cases, not only for proving the extent of the injuries but also for establishing causation. If you have been injured, it’s important to seek medical treatment as soon as possible. 

The medical records created during this treatment will help document the injuries you sustained and provide evidence that the injury was caused by the incident.

For example, if you were involved in a car accident, your medical records will show the injuries you sustained, the treatment you received, and the long-term effects of the injury. These records also demonstrate that your injuries were directly caused by the defendant’s negligence, rather than by some other factor.

5. Expert Testimony

In some personal injury cases, expert testimony may be necessary to establish liability, especially if the case involves technical or specialized knowledge. Expert witnesses are professionals in their field who can testify about aspects of the case that require advanced understanding. 

This can include medical professionals who can testify about the nature of your injuries or accident reconstruction experts who can explain how the accident occurred.

For instance, in a slip-and-fall case, an expert in building safety might testify that the condition of the property violated safety codes. Or in a car accident case, an accident reconstruction expert might provide testimony about how the crash happened based on physical evidence.

6. Maintenance Records and Logs

In certain cases, maintenance records can provide important evidence of liability. 

Property owners and businesses have a responsibility to maintain their premises in a safe condition, and failing to do so may constitute negligence. If a property owner failed to address known hazards, such as a broken step or a spilled substance, maintenance records can show that they had knowledge of the issue but didn’t take action.

For example, in a slip-and-fall case at a store, if the store had prior complaints or reports of a wet floor but failed to clean it up, maintenance logs or incident reports can demonstrate the store’s negligence in maintaining safe conditions.

Proving Causation in a Personal Injury Case

In addition to proving negligence, one of the most important aspects of a personal injury case is establishing causation. It’s not enough to show that the defendant was negligent; you must also show that their actions directly caused your injury. 

This can be especially difficult if there are multiple potential causes for the injury or if there is a gap in time between the accident and the injury.

To establish causation, you will need to provide evidence that directly links the defendant’s actions to your injury. This can be done through medical records, eyewitness testimony, expert testimony, or any other relevant evidence that shows that the injury would not have occurred without the defendant’s negligence.

The Importance of Acting Quickly

One of the most important steps in proving liability in a personal injury case is acting quickly. 

In Pennsylvania, as in other states, there are time limits for filing personal injury claims, known as the statute of limitations. In general, you have two years from the date of the accident to file a personal injury lawsuit in Pennsylvania. If you wait too long, you may lose your right to file a claim altogether.

Furthermore, evidence can disappear over time, and witnesses’ memories may fade. By acting quickly and contacting an attorney, you can help preserve evidence, interview witnesses, and start building a strong case from the outset.

Call Us for the Next Steps

At Goldberg, Goldberg & Maloney, we are committed to helping our clients prove liability and secure compensation. We’re proud to serve West Chester, Pennsylvania. Call today.