Going Undercover: How Private Investigators Build a Winning Personal Injury Case

August 31, 2025

Private investigators in personal injury cases are licensed professionals—many of them former law enforcement officers, military veterans, or career surveillance specialists—hired by your legal team to find, verify, and document the facts your case depends on.

Unlike police or insurance adjusters, private investigators work for you. Their job is to gather objective evidence: surveillance video, photos of hazardous conditions, witness interviews, timeline reconstructions, and social media activity. They go where attorneys can’t and collect the kind of hard proof that turns allegations into admissible facts.

In any personal injury lawsuit, the burden of proof rests entirely on the injured party. You have to prove not just that you were hurt, but that someone else’s negligence caused it. That proof has to be found, documented, and preserved. That’s exactly what a private investigator is trained to do.

Let our team do the legwork while you focus on recovery. Call Wapner Newman today at (215) 569-0900.

Why the Police Report Is Only the First Page of the Story

Police officers do a difficult job, but their primary focus is on clearing the scene, checking for criminal violations, and documenting the basics. Their investigation is not conducted with a future civil lawsuit in mind. As a result, many details are often left out.

What a Police Report Often Misses:

Hidden Causes: The report might state that one car rear-ended another, but it may not note contributing factors. For instance, it might miss a malfunctioning traffic light, a history of similar accidents at that same intersection due to poor road design, or a commercial driver’s logbook violations that show they were dangerously fatigued.
Unidentified Witnesses: In the moments after an incident, people who saw exactly what happened may have left before the police arrived. They might have assumed others would talk to the authorities, or simply did not want to get involved. Their testimony could be invaluable in corroborating your version of events.
Incomplete Liability: The report might assign fault to one driver, but it may fail to identify all the potentially responsible parties. This could include a vehicle manufacturer whose brakes failed, a bar that over-served the at-fault driver, or a negligent property owner who allowed a dangerous condition to exist.

Insurance companies understand these gaps all too well. They will use the limited scope of the initial report to question your claim, poke holes in your story, and justify a lower settlement offer or an outright denial.

What Does a Private Investigator Do for Your Case?

A private investigator is directed by your attorney to systematically gather the evidence required by Pennsylvania’s rules of civil procedure.

Key Investigative Tasks:

Locating and Interviewing Witnesses: Witness memories change, fade, and disappear fast. A skilled PI has techniques for finding witnesses who may have left the scene, tracking them down, and obtaining recorded statements while their recollections are still clear and accurate.
Uncovering Video Footage: In today’s world, cameras are everywhere. A PI will canvas the entire area surrounding the incident location for security cameras on nearby businesses, residential doorbell cameras, or municipal traffic cams that may have captured the event. This footage is the most unbiased witness of all, providing indisputable proof of what occurred.
Documenting the Scene: A PI might return to the scene at the same time of day and in similar conditions to the incident. They take detailed photographs, videos, and measurements. They look for physical evidence that may have been missed in the initial confusion, such as subtle skid marks, property damage, or road defects that contributed to the accident.
Performing Background Checks: When relevant, an investigator can look into the at-fault party’s history. This might involve pulling their driving record to see if there is a pattern of reckless behavior, or checking for a history of similar incidents or prior lawsuits that could establish a pattern of negligence.
Retrieving Documents: An investigator could be tasked with obtaining records that prove liability. This might include cell phone records to show a driver was texting at the time of a crash, vehicle maintenance logs for a commercial truck, or employment records for a driver who was on the clock for a company.

How Evidence Shapes Your Claim

In a criminal trial, the prosecution must prove guilt “beyond a reasonable doubt,” a very high bar. A personal injury case operates under a different, more lenient standard. You need to prove your claim by a “preponderance of the evidence.”

This is a legal concept that simply means you have to show that your version of events is more likely to be true than not. Imagine a scale of justice. If your evidence tips the scale even slightly in your favor—a 51% to 49% margin—you have met the burden of proof.

Each piece of evidence a private investigator gathers acts like a weight placed on your side of that scale. A witness statement, a piece of surveillance video, a photograph of a hazardous condition—each one adds to the overwhelming weight of the truth.

This evidence becomes central during the “discovery” process. This is the formal phase of a lawsuit where both sides are required to exchange all the information and evidence they have. The evidence gathered by our investigator is what we present to the other side.

Example: A witness statement obtained by a PI confirms that the other driver ran a red light while looking down at their phone.
Example: Surveillance video from a nearby convenience store contradicts the other driver’s story that you swerved into their lane.
Example: An accident reconstruction report, based on the PI’s detailed measurements and photos, shows the precise speed and angle of impact, proving the other driver was speeding.

This mountain of evidence is what ultimately convinces an insurance company to offer a fair settlement. Their decisions are based on risk assessment. When they see that the evidence is stacked so heavily in your favor, they know that going to trial would be a significant and likely losing gamble for them. This is how the role of private investigators in personal injury lawsuits directly translates into a better outcome for you.

What About the Insurance Company’s Investigator?

Yes, the at-fault party’s insurance company has its own team of investigators, adjusters, and lawyers. Their goal, however, is fundamentally different from ours. They are actively looking for any reason to deny, delay, or devalue your claim. Their job is to protect their company’s bottom line, not to ensure you are made whole.

One of their most common tactics is surveillance. Under the broad rules of evidence gathering, they may hire their own private investigator to follow you. They may try to capture video of you doing daily activities—carrying groceries, mowing the lawn, playing with your children—hoping to find something they can twist to argue that your injuries are not as severe as you and your doctors claim.

We know that this might seem unsettling, but it is just a standard part of the process that we anticipate and prepare you for. If you have been seriously injured, you should not have to live in fear of being watched. This is where having your own legal team makes all the difference.

How We Address Their Tactics:

We Prepare You: The first step is awareness. We will tell you what to expect from their investigation.
We Use Their Evidence: Sometimes, their surveillance backfires spectacularly. Footage of you visibly struggling to lift a bag of groceries, or moving stiffly and with pain as you walk to your car, is actually become powerful evidence that helps to prove the extent of your pain and limitations.
We Uphold Your Rights: There are strict rules governing surveillance in Pennsylvania. An investigator cannot harass you, trespass on your property, look into your windows, or misrepresent who they are to you or your neighbors. As outlined by the state, licensed investigators must operate within legal and ethical bounds. Our team ensures these lines are never crossed.

The Wapner Newman Approach to Investigation

At Wapner Newman, we do not just hire an outside investigator and wait for a report. We direct the entire investigative process from start to finish. The investigation is a direct extension of our legal strategy, guided by the specific questions that need to be answered to prove your case and secure the compensation you need to recover.

How We Manage the Investigation:

Strategic Direction: From our very first meeting with you, we begin to identify the key questions that need to be answered to establish liability and document the full extent of your damages. We then task the investigator with finding the specific answers to those strategic questions.
Vetted Professionals: We work with a trusted network of licensed, bonded, and highly experienced private investigators located right here in Pennsylvania. These are professionals who understand not just how to find information, but how to gather it in a way that ensures it will be admissible in court under the strict Federal Rules of Evidence.
Integrated Strategy: The investigator’s findings are not treated as a separate report to be filed away. The evidence they uncover is woven directly into our negotiation strategy with the insurance company and, if a fair settlement cannot be reached, into our presentation at trial. This creates a seamless, powerful, and persuasive narrative.

Frequently Asked Questions About Private Investigators

How much does it cost to hire a private investigator for my case?

You pay nothing out of pocket. At Wapner Newman, we handle personal injury cases on a contingency fee basis. This is a simple arrangement that means we cover all the upfront costs of litigation, which includes the investigator’s fees, expert witness fees, and court filing costs. We only receive a fee if we win a settlement or a verdict for you. If we do not secure compensation for you, you owe us nothing.

Is it legal for a private investigator to follow me in Pennsylvania?

Yes, it is generally legal for a PI to conduct surveillance on you in public spaces where there is no reasonable expectation of privacy. This includes watching you as you walk down the street, go to the store, or drive your car. However, they cannot trespass on your private property, place a GPS tracker on your vehicle without consent, or use illegal methods like wiretapping to obtain information. We ensure your rights are protected throughout the entire process.

What happens if the investigator doesn’t find any new evidence?

Even when an investigation confirms the facts that are already known, that work still has immense value. It reinforces the strength of the evidence we already have and effectively closes off avenues the insurance company might have tried to use to challenge your claim. It shows them that we have performed our due diligence and that the facts of the case are solid, which can encourage them to negotiate in good faith.

Can a private investigator testify in court?

Absolutely. A private investigator can be, and often is, called as a witness at trial. They will testify about the evidence they gathered firsthand. This could include authenticating a photograph they took, describing the conditions at the scene of the accident, or presenting a crucial piece of video they uncovered. Their professional, objective testimony as a third-party fact-finder can be very persuasive to a judge and jury.

How does an investigator help if I was partially at fault?

This is a situation where an investigator’s work is particularly important. Pennsylvania uses a “modified comparative negligence” rule. In simple terms, this legal concept means you can still recover damages as long as your share of the fault is not more than 50%. An investigator might uncover evidence showing the other party bears the vast majority of the blame, thereby protecting your right to compensation and maximizing the amount you can receive.

Building Your Case on a Foundation of Fact

A successful personal injury claim is not won by chance or luck. It is built, piece by piece, on a solid foundation of documented evidence.

While you focus on what matters most—your health, your recovery, and your family—our team, in partnership with skilled and dedicated investigators, will do the hard work of laying that groundwork.

Let us begin the important work of building your case. Contact Wapner Newman for a free, no-obligation consultation by calling (215) 569-0900 today.