Preserving Evidence After a Car Accident in New York

Evidence is the foundation of every personal injury case. Without evidence, even the most seriously injured car accident victim can struggle to prove liability, establish causation, or demonstrate the full scope of their damages. In New York — where defendants routinely hire experienced insurance defense attorneys whose sole job is to minimize your recovery — evidence preservation is not optional. It is essential, and the window to act is measured in hours, not weeks.

This guide explains what evidence matters most after a New York car accident, how quickly each type of evidence disappears, how to preserve it, and how the spoliation doctrine protects you when the other side destroys evidence they were obligated to keep.

Why Evidence Disappears So Fast

The physical world does not pause to wait for litigation. Surveillance cameras overwrite their footage on rolling 24 to 72-hour cycles. Dashcam cards fill and loop. Witnesses forget details — and change their stories. Skid marks fade in rain and traffic. Debris is swept from the roadway within hours by highway crews. Vehicles are repaired or sold before their event data recorders can be downloaded. The defendant’s employer transfers the company vehicle to another driver. A business closes and discards its security DVR.

These are not hypothetical scenarios. They are the routine way that critical evidence disappears in the weeks after a car accident in New York, often before the injured victim has even retained an attorney. The cases that are won at trial — or settled at full value — are almost always the cases where evidence was preserved. The cases that are lost, or settled for a fraction of their true value, are often the cases where evidence was allowed to disappear.

Types of Evidence to Preserve

1. Surveillance and Security Camera Video

Surveillance cameras are everywhere in the New York metropolitan area: gas stations, convenience stores, pharmacies, banks, office building lobbies, parking garages, traffic control systems, and residential doorbells. Red-light cameras and speed cameras operated by the NYPD and NYSDOT capture footage at intersections across the five boroughs and are increasingly deployed on Long Island. NYSDOT maintains highway cameras on the major expressways.

The critical fact: most surveillance systems overwrite their recordings on a 24 to 72-hour loop. After that, the footage is gone permanently.

Your attorney must send a preservation letter to every business or property owner with a camera that could have captured the accident — immediately, the same day the attorney is retained. The letter must identify the date, time, and location of the accident and demand that all video recordings from the time of the accident be preserved pending litigation. Once on notice, the business has a duty to preserve; if they destroy the footage after receiving the letter, they face spoliation sanctions.

Do not wait to hire an attorney and then expect the attorney to catch up. If you cannot reach an attorney immediately, go to the businesses yourself, explain that you were in an accident, and ask them to preserve their footage. Write down the names of any employees you speak to. Then retain counsel immediately.

2. Dashcam Footage

Dashboard cameras have become increasingly common in New York. Your own dashcam footage can be the single most valuable piece of evidence in your case — showing the defendant’s vehicle running a red light, the point of impact, road conditions, and the immediate aftermath. Preserve your dashcam footage immediately after the accident by removing the SD card and copying the files to a computer. Do not continue to use the dashcam and allow the recording to be overwritten.

Other vehicles at the scene — witnesses, delivery trucks with fleet cameras, ride-share vehicles (Uber and Lyft vehicles frequently have driver-facing and forward-facing cameras), commercial vehicles, and buses — may also have captured the accident. Your attorney can send preservation letters and subpoenas to obtain this footage.

3. Event Data Recorder (EDR) / Black Box Data

Modern vehicles — including passenger cars, trucks, and SUVs — contain an event data recorder (EDR), often called a “black box.” EDRs capture a snapshot of vehicle data in the seconds before and during a crash: vehicle speed, brake application (was the brake pedal depressed?), throttle position, steering angle, airbag deployment timing, seatbelt status, and engine RPM. This data is recovered by downloading the EDR using specialized equipment.

EDR data is extraordinarily powerful evidence. It can prove the defendant was traveling at 62 mph in a 35-mph zone, that they did not brake before impact, and that the crash severity was consistent with the plaintiff’s injuries. EDR data can also disprove a defendant’s lie — for example, the claim that they were driving slowly or that the plaintiff’s vehicle was the one that accelerated into the collision.

The threat to EDR data is vehicle repair or disposal. Once the vehicle is repaired, the EDR may be reset or replaced. Once a vehicle is sold or crushed, the EDR is lost. Your attorney must send a preservation letter — often called a litigation hold letter — to the defendant, the defendant’s attorney, the defendant’s insurance company, and any body shop holding the vehicle, immediately after the accident, demanding that the vehicle not be repaired, altered, or disposed of before the EDR can be downloaded by a qualified accident reconstruction engineer.

Under CPLR Article 31, the defense can be compelled to produce the vehicle for EDR download as part of discovery. But if the vehicle has been repaired or destroyed before then — and if no preservation letter was sent — the data is gone and there may be no spoliation remedy because no duty to preserve was triggered.

4. Cell Phone Records

Distracted driving — specifically texting or using a handheld phone while driving — is illegal in New York under Vehicle and Traffic Law §1225-d and is one of the leading causes of serious car accidents. If you suspect the defendant was on their phone at the time of the crash, cell phone records are essential evidence.

Cell phone records showing call and text activity at the time of the accident are obtained by subpoena to the cellular carrier (AT&T, Verizon, T-Mobile, etc.) through CPLR Article 31 non-party discovery. These records can show precisely whether the defendant was making a call or sending a text message at the time of impact, with timestamps accurate to the second. Many modern smartphones also contain GPS location data that can corroborate accident reconstruction.

Critically, cell phone carriers do not retain detailed records indefinitely. Tower ping data and detailed call/text logs are typically retained for 18 to 24 months depending on the carrier. In longer cases, this data can be lost before it is requested. Your attorney should move quickly to subpoena these records.

5. Social Media Evidence — Both Sides

Social media works in two directions in car accident litigation. First, defense attorneys and insurance companies routinely search Facebook, Instagram, TikTok, and other platforms for posts by the plaintiff that could be used to minimize the claimed injuries. A photo of the plaintiff hiking six weeks after a “permanently disabling” injury — even if taken on a good day — can be devastating at trial. Do not post anything about your accident, your injuries, your recovery, or your activities on social media after an accident. At all.

In Romano v. Steelcase Inc., 30 Misc. 3d 426 (N.Y. Sup. Ct. 2010), the court ordered disclosure of the plaintiff’s private Facebook and MySpace content, holding that the plaintiff’s public portions of her profile showed an active lifestyle that was inconsistent with her claimed injuries, creating a reasonable basis to believe the private content might contain additional relevant material. Courts have continued to follow and expand this reasoning.

Second, social media can be evidence against the defendant. If the defendant posted about the accident, bragged about their speed or driving, or later deleted posts related to the crash, screenshots of that content — taken immediately before posts are deleted or accounts are set to private — can be powerful evidence of liability and consciousness of guilt. Screenshot everything relevant as soon as possible.

6. Weather and Road Condition Records

Weather at the time of the accident — rain, snow, ice, fog, reduced visibility — is often relevant to both liability (was the defendant driving too fast for conditions?) and to the physical dynamics of the crash (longer stopping distances, reduced friction). Historical weather records are available from NOAA’s National Centers for Environmental Information and can be retrieved for any location and time with reasonable specificity.

Road conditions — standing water, ice patches, potholes, missing or obscured traffic signals, faded lane markings — may also support a claim against a municipality for a dangerous condition on a public roadway in addition to the claim against the at-fault driver. If a road condition contributed to your accident, a Notice of Claim against the municipality must be filed within 90 days under General Municipal Law §50-e, which means this investigation must happen quickly.

7. Physical Evidence at the Scene

Skid marks, gouge marks in the pavement from metal contact, vehicle fluid deposits, and debris fields on the roadway document the point of impact, the direction of travel, and the crash dynamics. This evidence is typically cleared from highways within hours by highway crews and is washed away by rain within days.

Take photographs immediately at the scene if you are physically able to. If you cannot, ask someone at the scene to photograph for you. Photograph: both vehicles from multiple angles (each corner, front, rear, sides, interior), the roadway showing skid marks and debris, traffic signals and signage, road conditions, any obstructions to visibility, and the surrounding area in all directions. Hire an accident reconstruction engineer as early as possible to inspect the scene before evidence is lost.

8. Vehicle Damage Photographs Before Repair

The pattern and severity of vehicle damage is direct evidence of the crash mechanics. A vehicle with heavy frontal intrusion and floor pan deformation is powerful corroboration for a calcaneus fracture, pilon fracture, or bilateral lower extremity injury caused by axial loading. A vehicle with extensive driver-door intrusion corroborates shoulder, rib, and head injuries on the driver’s side.

Do not allow your vehicle to be repaired until it has been photographed comprehensively and, if possible, inspected by an accident reconstruction engineer. Before you authorize repair work at a body shop, ensure that high-resolution photographs documenting all damage have been taken and preserved. Many body shops will photograph vehicles as a standard practice, but confirm this explicitly and request copies.

9. Medical Records and Bills From Day One

Every interaction with the medical system after your accident must be documented and preserved. This means requesting copies of all records — emergency department records, imaging studies (X-ray, CT, MRI), operative reports, physical therapy notes, pain management records, and primary care follow-up notes — from every provider who treats you. Obtain copies of all bills as well.

Keep a personal injury journal documenting your daily pain levels, functional limitations (what you could not do today that you could do before the accident), and the impact of your injuries on your work, family life, and recreational activities. This contemporaneous documentation is powerful evidence of non-economic damages.

Spoliation of Evidence in New York

When a party — or a third party — destroys, alters, or fails to preserve evidence after they are on notice that it may be needed for litigation, they may be liable for spoliation of evidence. In New York, the landmark case is Ortega v. City of New York, 9 N.Y.3d 69 (2007), in which the Court of Appeals held that a duty to preserve evidence arises when a party is on notice that litigation is reasonably anticipated and knows or should know that the evidence will be material to future litigation.

The duty is triggered by notice — not by the filing of a lawsuit. Sending a preservation letter to the defendant immediately after a serious accident puts them on notice. If they destroy relevant evidence after receiving that letter, they face spoliation sanctions in the lawsuit.

Spoliation Sanctions Under New York Law

New York courts impose a range of sanctions for spoliation depending on the degree of culpability and the prejudice caused to the innocent party:

Adverse inference instruction: The court instructs the jury that it may — but is not required to — presume that the destroyed evidence would have been unfavorable to the party who destroyed it. This is the most common sanction for negligent destruction. See Patterson v. Turner Construction Co., 88 A.D.3d 617 (1st Dep’t 2011).

Preclusion of evidence: The court precludes the spoliating party from introducing evidence on the subject matter related to the destroyed evidence. This can be enormously damaging to a defense, for example precluding the defendant from offering their own version of the crash events.

Striking of pleadings: In cases of willful or intentional spoliation — deliberate destruction of evidence known to be relevant — the court may strike the defendant’s answer, effectively granting the plaintiff judgment on liability. This is reserved for the most egregious cases.

Monetary sanctions: The court may award attorneys’ fees and costs incurred because of the spoliation.

Preservation and Litigation Hold Letters

A preservation letter — sometimes called a litigation hold letter — is a written demand sent by your attorney to anyone in possession of potentially relevant evidence, notifying them of the accident, identifying the evidence that must be preserved, and placing them on legal notice of their duty to preserve pending litigation. The letter should reference the party’s obligations under CPLR Article 31 and the consequences of destruction under the spoliation doctrine.

Preservation letters should be sent immediately — ideally within 24 to 48 hours of retaining counsel — to:

• The defendant driver
• The defendant’s employer (if the defendant was driving a company vehicle or on company business)
• The defendant’s automobile insurance company
• Any municipality that owns a traffic camera, highway camera, or red-light camera at the scene
• Businesses with surveillance cameras in the vicinity
• The rideshare company (Uber, Lyft) if the defendant was a rideshare driver
• Body shops where either vehicle was taken
• Employers of the defendant if a commercial vehicle was involved

The letter should specifically identify: the date, time, and location of the accident; each category of evidence to be preserved (vehicle, EDR/black box, surveillance footage, dashcam footage, cell phones, employment records if commercial driver); and a demand that no evidence be altered, destroyed, or transferred.

Subpoenas for Third-Party Evidence

When evidence is in the possession of a third party — a cellular carrier, a business with a surveillance system, a municipality that operates traffic cameras — your attorney obtains it through a subpoena duces tecum under CPLR Article 31. A subpoena commands the third party to produce specified documents and records. For non-party discovery involving surveillance footage from a business, the attorney typically sends a preservation letter first and then follows up with a subpoena if the business does not cooperate voluntarily.

Preservation letters go out fastest from local counsel who know the carriers — see choosing the best Long Island personal injury lawyer.

Acting Quickly Is Everything

The single most important thing you can do after a serious car accident in New York is retain a qualified personal injury attorney as quickly as possible — not in two weeks after you are discharged from the hospital, and not after you have spoken with the insurance adjuster. Within days of your accident, critical evidence may already be gone.

At the Law Office of Jason Tenenbaum, P.C., we act immediately on evidence preservation. From the moment you call us, we begin identifying and preserving the evidence that will win your case. If you or a family member has been seriously injured in a car accident on Long Island or anywhere in New York, contact our experienced Long Island car accident lawyer team today for a free consultation. There is no fee unless we recover compensation for you.