Gathering Evidence While It Still Exists

Most people assume the facts will still be there when they need them. They will not. Camera systems record over themselves. A damaged car gets repaired or sold for salvage. A trucking company's logs can be lawfully discarded after a few months. The witness who saw everything moves away. This chapter of The DC, Maryland & Virginia Injury Guide explains what evidence exists after a DMV crash or fall, how fast it goes, and how to keep it.

Key points

• Video and electronic data disappear first, often within days or weeks.
• Public agencies hold traffic camera footage, 911 audio, and body-worn camera video, and public records laws set response times for requests.
• Commercial trucking records may be kept for as little as six months.
• A written preservation letter puts the other side on notice, and D.C. law gives real consequences for destroying evidence.

What evidence disappears first after a DMV crash?

Video and electronic data disappear first, usually within days to weeks, because most systems overwrite themselves automatically. Physical evidence (skid marks, debris, a broken handrail) is close behind, since roads get cleaned and hazards get repaired. Witness memory fades more slowly but steadily. Records kept by companies and agencies last longer, but many are kept only for set periods.

Contributory negligence makes this more urgent here than in most places. When an insurer can deny the whole claim by arguing you were slightly at fault, the side with the clearest record of what actually happened usually wins. Video that shows the light was red ends arguments that witness testimony alone cannot.

Traffic cameras, 911 calls, and police video

Traffic and enforcement cameras are common in D.C. and in parts of Maryland and Northern Virginia, but many capture only still images of a violation rather than continuous video, and retention varies by system. Whether anything exists for your moment is a question to ask right away. The 911 call itself can be powerful evidence too: who called, what they said, and what the other driver admitted in the background.

Records held by public agencies are generally reached through public records laws, and the timelines are short on paper and longer in practice:

• D.C.: any person may request public records, and agencies must generally respond within 15 business days; requests for MPD body-worn camera recordings go to MPD, which has 25 business days (D.C. Code § 2-532).
• Maryland: the Public Information Act requires a custodian to allow inspection of public records at any reasonable time, except as the law provides otherwise (Md. Code, Gen. Provis. § 4-201).
• Virginia: the Freedom of Information Act opens public records to citizens of the Commonwealth and requires a response within five working days (Va. Code § 2.2-3704).

Some records are exempt or withheld, and footage on a short recording cycle can be gone before a request is even processed. That is why a specific, early request matters.

Metro, buses, and transit video

If you were hurt on or by a Metrorail train, a Metrobus, or a county bus such as Ride On, TheBus, ART, DASH, or the Fairfax Connector, there may be onboard and station cameras, operator reports, and vehicle data. All of it sits with a public agency that has its own retention schedule and its own lawyers. Write down the route, the bus or car number, and the exact time, and ask early. Claims against transit agencies and local governments also come with short notice rules, which Why You Should Talk to a Lawyer Early and Injured by a Government Vehicle, on Metro, or on Public Property explain. Our Metro injuries page covers these claims in more depth.

Business, home, and dashcam video

Almost every intersection in the region is within view of a storefront, gas station, bank, apartment lobby, or doorbell camera. Small systems often record over themselves in a day or two; larger ones may keep a few weeks. Nobody will save that footage unless asked. If you or a family member can walk in the next day and ask the manager to hold the video for a specific date, time, and camera, do it, and write down who you spoke with. Ask about dashcams too: other drivers, rideshare and delivery vehicles, and commercial fleets increasingly record the road.

The vehicles themselves

Photograph every vehicle, inside and out, before it is repaired or sold for salvage. Crush damage, airbag deployment, and the resting positions of the cars help show how a crash happened.

When an insurer declares a car a total loss, it is usually sold at salvage auction within weeks. In the most serious crashes, it may be worthwhile to keep a vehicle so it can be examined, so talk to a lawyer before a badly damaged car leaves the lot.

Phone records

If you believe the other driver was texting or on a call, that can be proven. Carriers keep call, text, and data logs, and the phone itself holds more. But carriers keep records for limited periods and phones get replaced. A preservation demand now, followed by a subpoena once a lawsuit is filed, is how this evidence is captured. See our page on distracted driving crashes.

Trucks and commercial vehicles

Commercial carriers generate records ordinary drivers do not: hours-of-service logs (now usually kept on electronic logging devices), driver qualification and drug testing files, inspection and maintenance records, dispatch records, and often camera footage. Federal rules require carriers to keep drivers' records of duty status and supporting documents for at least six months (49 C.F.R. § 395.8(k)), which means some of it can be lawfully discarded after that. Carriers and their insurers also send investigators to the scene quickly. Our truck accidents page explains how these cases differ.

Store, apartment, and property cases

If you fell in a store, restaurant, or apartment building, the owner almost certainly made an internal incident report and has video of the area. You will not be handed either. Ask the manager in writing to preserve both, along with cleaning, inspection, and maintenance logs for that day. Whether the owner knew about the hazard, and for how long, is usually the central question in a premises liability case, and those logs answer it.

Witnesses and the scene

Independent witnesses are some of the most persuasive evidence there is, because they have no stake in the outcome. If you missed someone at the scene, the police report, nearby businesses, and regular passersby can help find them. Contact witnesses promptly and politely, ask them to write down what they saw, and never coach them.

Go back to the scene if you can, at the same time of day and in similar weather. Photograph the sight lines, the signal timing, the crosswalk markings, the parked trucks that block the view, and the hazard before it is repaired. In a contributory negligence fight over whether you "should have seen" something, those photographs often decide the answer.

What does a preservation letter do, and what if evidence is destroyed anyway?

A preservation letter (sometimes called a spoliation letter) is a written demand to the other driver, their insurer, a business, or an agency, identifying specific evidence and directing that it be kept because a claim is likely. It turns an innocent deletion into a knowing one.

D.C. law backs that up. When a party fails to preserve evidence within its exclusive control, a fact-finder may be permitted to infer that the evidence would have been unfavorable to that party, and D.C. also recognizes an independent claim for negligent or reckless destruction of evidence by someone who had a duty to preserve it (Holmes v. Amerex Rent-A-Car, 710 A.2d 846 (D.C. 1998)). Even so, no remedy is as good as the evidence itself. Speed matters more than anything else in this chapter, which is a large part of why we tell people to talk to a lawyer early.

Related reading

• Nobody saw the crash: can you still win a Virginia injury case?
• Store falls in Maryland: camera footage and sweep logs
• Why truck crash cases are different
• Hurt on Metro: your rights as a WMATA passenger
• Guide chapter 2: contributory negligence in the DMV

Responsible attorneys: Ryan C. Posey and Jacob M. Lebowitz. Posey Lebowitz PLLC, 3221 M Street NW, Washington, DC 20007.