The seconds after a car accident, a slip on a wet floor, or a piece of equipment failing on a job site are chaotic. Your adrenaline is pumping. You might be hurt, confused, or angry. In that moment, the last thing on your mind is asking strangers for their names and phone numbers. But if there is one single action that determines whether you get compensated for your losses—or walk away with nothing—it is getting the contact information of every witness who saw what happened. This is not a suggestion. It is the most important step you can take before you even think about calling a lawyer or filing an insurance claim.

Witnesses are the only people who are not you, not the other party, and not paid by either side. They have no skin in the game. When a liability claim eventually lands in front of an insurance adjuster, a mediator, or a judge, the testimony of an independent witness cuts through he-said-she-said arguments. Insurance companies and defense attorneys know this. That is why they will work hard to discredit or ignore witness statements that hurt their case. And if you do not have contact information for those witnesses, you have already lost your best evidence without ever knowing it.

Start by identifying who counts as a witness. It is not only the person who stopped to help you after a crash. Any person who observed the incident—or even a key moment leading up to it—is a witness. This includes passengers in your car, pedestrians on the sidewalk, employees in a nearby store, or people who were filming on their phones. Do not assume that someone is too busy or unwilling to help. Most people are more cooperative than you expect, especially if you ask calmly and explain that you just need their name and a way to reach them.

Approach each witness immediately, while the scene is still fresh. Do not wait for the police to arrive. Officers will take statements from witnesses they find at the scene, but they often miss people who leave before the police get there. If you are physically able, move to each witness and say something direct: “I was involved in this incident. Would you be willing to give me your name and phone number in case I need to ask you what you saw?” Keep it short. Avoid arguing about what happened. Do not try to lead them or suggest what they should say. You just want the contact information. If they hesitate, explain that you are not asking them to commit to anything right now—you only want the ability to reach them later. If someone refuses, thank them and move on. Do not pressure them. But note their appearance, clothing, or anything that might help you identify them later.

Once you have a name and phone number, also ask for an email address if they are willing. People change phone numbers. Email addresses tend to be more stable. If you have a pen and paper, write it down yourself. If you do not, ask them to write it down for you or send a text to your phone. The goal is to get the information onto a durable record before you lose it. Do not rely on memory. Adrenaline and stress will cause you to forget names within hours.

Now, what about the witness who says, “I’ll just tell the police what I saw”? That is not enough. Police reports are not always complete. Officers may not record every witness. Even if they do, the report may take days or weeks to become available, and insurance companies have a habit of settling claims before witnesses can be located. If the witness walks away without giving you their information, you have no way to follow up. And if the police report later says “witness left scene before statement taken,” you are stuck.

There is a second layer to this that most people overlook. Witnesses can become harder to find over time. They move, change jobs, or simply forget the details. The longer you wait to contact them, the less reliable their memory becomes. Insurance adjusters and defense lawyers know this. When they see a claim where witness contact information was gathered immediately, they treat the claim more seriously. When they see a claim where no witness information exists, they assume the witnesses either did not exist or did not support your version of events. That assumption works against you.

Do not assume that a witness who seems supportive at the scene will stay supportive. People change their minds. They get contacted by the other party’s insurance company and might be persuaded to “clarify” their statement. The only way to protect yourself is to have their contact information so you can speak with them first, or have your attorney speak with them, before anyone else does. If you lose that information, you lose the chance to lock in their account of what happened.

There is also a practical reason to get witness contact information right away: you may not realize until later that you need it. Injuries do not always show up immediately. Property damage may be worse than it looks. The incident might seem minor at first, then turn into a major liability claim weeks later. By then, witnesses are gone. You cannot go back and collect names. The window closes fast.

In short, treat witness contact information like you treat emergency medical care. Do it first. Do it yourself. Do not delegate it to someone else. The difference between a successful liability claim and a frustrating denial often comes down to whether you can produce a neutral person who says, “Yes, I saw it, and that is how it happened.” Without that, you are left with only your word against theirs. And in the world of liability claims, that is not a fight you want to be in.