Evidence Collection Checklist
The evidence you collect - or fail to collect - in the hours and days after an accident can significantly affect your options. Photographs lose usefulness once conditions change, vehicles get repaired, and camera footage is not kept indefinitely, so understanding what typically matters and acting promptly can make a meaningful difference. This checklist helps you think through the types of evidence common accident and injury situations tend to involve, from scene photos to witness contact information to records held by other parties, and organizes them so you know where to focus first. It is educational only and does not replace guidance from a licensed attorney who has reviewed your specific situation.
This checklist provides educational information about common types of evidence in personal injury cases. It is not legal advice. The specific evidence that matters in your case depends on your individual circumstances. Consult an attorney for guidance tailored to your situation.
This checklist provides educational information about common types of evidence in personal injury cases. It is not legal advice. The specific evidence that matters in your case depends on your individual circumstances. Consult an attorney for guidance tailored to your situation.
Question 1 of 5
What type of accident were you involved in?
Why Evidence Collection Matters Immediately After an Accident
Evidence in accident cases can disappear quickly. Skid marks fade, surveillance footage gets overwritten, witnesses scatter, and physical conditions at the scene change. Vehicle damage gets repaired. Businesses claim they have no camera footage.
The window for gathering the most critical evidence is often just 24 to 72 hours. Understanding what to look for - and acting promptly - can make a meaningful difference in your ability to document what happened.
- Photograph the scene before anything is moved if it is safe to do so
- Surveillance footage at some businesses can be overwritten in as little as 24 to 72 hours, depending on the system
- Preserving a damaged vehicle before repairs is critical for product liability claims
Scene and Physical Evidence
At the scene of the accident, photograph everything you can safely reach: all vehicles involved (from multiple angles including damage, license plates, and position on the road), road conditions, skid marks, traffic signals, signage, weather conditions, and any visible hazards that contributed to the accident.
If you were injured in a fall, photograph the exact location of the hazard - a wet floor, cracked pavement, missing handrail, or uneven surface - before it is corrected. More photos are always better than fewer.
- Photograph your own injuries at the scene and daily for several weeks after
- Note street names, cross streets, and landmarks so the exact location is documented
- If there is a business nearby, ask if they have outdoor cameras that captured the event
Documents and Records to Request
Key documents in an accident case include the official police report (typically available 3 to 10 days after the incident through the filing agency), medical records and bills for all treatment received, the other party's insurance information and policy documents, your own insurance declarations page, any incident reports filed with a business or property owner, and employment records documenting missed work.
Requesting records proactively - rather than waiting to see if they become relevant - is advisable, as some records have fees and processing time.
- Request the police report from the specific agency that responded (city police, county sheriff, CHP)
- Ask your medical providers for itemized billing statements, not just summary totals
- Request incident reports in writing so there is a record of your request
Witness Information and Statements
Witness accounts can be among the most persuasive evidence in an accident case, particularly when liability is disputed. At the scene, ask anyone who saw the accident for their name, phone number, and a brief description of what they observed. Do not pressure witnesses, but do capture their contact information before they leave.
If a witness is willing to provide a written statement or speak with your attorney, that can be valuable. Witnesses can also include bystanders who arrived after the accident but observed the scene or your injuries.
- Get full name and at least one phone number from each witness immediately
- Note what each witness told you they saw - details are easier to recall immediately
- Witnesses to your injuries and their visible severity are also valuable, not just those who saw the impact
Digital and Electronic Evidence
Modern accident cases increasingly involve digital evidence. Dashcam footage from your vehicle or nearby vehicles can be decisive. Rideshare app data (Uber, Lyft) records trip details and driver behavior. Red light camera and traffic monitoring footage may exist. Businesses along the route may have external security cameras. Your own phone records may confirm that the other driver was distracted.
Surveillance footage in particular is time-sensitive - send a written preservation request to any business that may have relevant camera footage as soon as possible after the accident.
About this topic
Why Evidence Can Disappear Quickly
Evidence connected to an accident does not stay the same over time. Vehicles get repaired, businesses replace or paint over damaged property, weather washes away skid marks, and witnesses' memories fade. Many businesses and property owners also operate their own camera systems with retention practices that vary considerably, meaning footage is not always available if you wait too long to ask. None of this means evidence disappears overnight, but it does mean that acting sooner rather than later, when it is safe and reasonable to do so, generally preserves more options than waiting. Understanding this general pattern is why gathering and requesting evidence promptly is commonly recommended after an accident.
What a Preservation or Spoliation Letter Is
When evidence may be time-sensitive, such as camera footage, some people or their attorneys send a written request asking a business or other party to keep that evidence rather than delete or record over it. This is sometimes called a preservation letter, related to the legal concept of spoliation, which generally refers to the loss or destruction of evidence that should have been kept. Sending this kind of written request does not guarantee evidence will survive, but it creates a documented record that the request was made, which can matter later if evidence turns out to be missing. An attorney can advise on the best way to send this kind of request for your situation.
Why Different Types of Evidence Matter Together
No single piece of evidence tells the whole story of an accident. Scene photos show conditions at the time, witness statements offer an outside perspective, official reports capture an initial account, and records from businesses or other parties can fill in details you would not otherwise have access to. Because each type of evidence has its own limitations, insurers and attorneys generally look at the fuller picture rather than any one document alone. This is part of why organizing what you have, and identifying what you still need, is a useful early step rather than something to leave until later in the process.
Frequently Asked Questions
You can typically request a copy of the police report from the law enforcement agency that responded - city police department, county sheriff, or the California Highway Patrol (CHP). Reports are usually available 3 to 10 days after the incident. In California, you can often request them online through the agency's records portal or in person. There is usually a small fee.
Send a written preservation request to the business - by certified mail if possible - immediately after the accident, before footage is overwritten. State the date, time, and location of the incident and request that all footage from relevant cameras be preserved. If you have an attorney, they can send a formal preservation letter on your behalf, which puts the business on formal notice and can strengthen your position later if the footage is destroyed.
Some evidence will already be lost, but much can still be obtained. Police reports, medical records, employment records, witness contact information, and your own photographs of injuries taken in the days following the accident are still valuable. An attorney can send formal preservation letters and subpoena records that you may not be able to access on your own.
A spoliation letter, also called a preservation letter, is a written request asking a business or other party to keep evidence, such as camera footage, rather than delete or destroy it. It is generally sent as soon as possible after an accident when evidence may be time-sensitive. You do not need special legal training to send one yourself, though an attorney can help make sure it covers what you need and reaches the right person.
Many businesses and property owners use camera systems with their own retention practices, which vary from one location to another, so footage is not always kept indefinitely. Weather, repairs, and everyday wear can also change physical evidence at a scene. This is generally why gathering and requesting evidence as soon as it is safe and reasonable to do so is commonly recommended after an accident, rather than waiting.
Even if you cannot revisit the scene right away, other types of evidence may still be available, including official reports, medical records, and information from witnesses or other parties. Some evidence changes faster than others, so it is generally worth requesting what you can as soon as you are able, rather than assuming everything has already been lost.