The Evidence Window After a Houston Car Wreck: What Disappears, When, and How to Stop It

The evidence that determines the outcome of a car wreck claim in Houston does not wait for a legal deadline. It disappears on a schedule that has nothing to do with the two-year statute of limitations. By the time many injured drivers decide to contact an attorney, some of the most valuable evidence in their case is already gone, not lost, not misplaced, but overwritten, erased, or discarded under the standard data retention policies of the businesses and carriers who held it.

Harris County recorded 67,644 total traffic crashes in 2023 according to the Texas Department of Transportation. That is 185 crashes every single day in one county. Every one of those crashes generated evidence. The majority of it no longer exists in the form it held in the first 24 hours after impact.

Understanding exactly what disappears, when it disappears, and what a Houston car wreck attorney must do in the first week to stop that process is among the most practically useful things an injured Houston driver can know.

The Surveillance Footage Window: 14 to 30 Days

Surveillance cameras mounted on businesses, parking structures, ATMs, gas stations, and retail locations along Houston’s crash corridors record continuously. In most commercial settings, these cameras operate on an overwrite loop. When storage fills, the oldest footage is automatically deleted to make room for new recordings. In most Houston commercial locations, that loop runs between 14 and 30 days.

A crash that occurred on Westheimer Road, on a Loop 610 feeder, or at a major intersection near a shopping center likely occurred within view of multiple cameras. That footage may show the seconds before impact, the vehicle speeds, the signal status at the intersection, and the point of first contact between the vehicles. It may resolve a fault dispute that the police report left ambiguous.

To preserve it, an attorney must send a formal written preservation demand to the property owner within the first two weeks. That demand creates a legal obligation to retain the footage and ceases the overwrite cycle. A preservation demand sent at day 32 finds empty storage. The footage is gone.

The Dashcam Window: 24 to 72 Hours

Most dashcam devices installed in personal vehicles operate on a continuous loop. When the device’s memory card fills, it begins overwriting the oldest files with new recordings. On a standard commuter dashcam with a 32GB card recording at 1080p resolution, that loop completes in approximately 24 to 72 hours of continuous operation.

A driver who was hit and whose dashcam captured the impact needs to physically remove the device from the vehicle or copy the relevant files before driving again. Every subsequent drive overwrites previous footage. An attorney who issues a preservation letter to the at-fault driver at week three, or who subpoenas the dashcam at week five, may find nothing recoverable.

The Black Box Window: Variable but Often Less Than 30 Days

Event data recorders, commonly called black boxes, are standard equipment in most modern vehicles manufactured after 2012. They record pre-crash speed, braking force, acceleration, seatbelt status, and steering input in the seconds before and after impact. In commercial vehicles governed by FMCSA regulations, electronic logging devices record driver hours, location, and vehicle diagnostics on a continuous basis.

FMCSA regulations require commercial carriers to retain electronic logging device data for a minimum of six months. However, some carrier maintenance systems have shorter internal retention cycles, and data from smaller fleets may be managed differently. A legal hold letter addressed to the carrier’s designated safety officer, sent in the first week, creates a documented legal obligation to preserve the data. A letter sent six weeks later may arrive after the relevant data cycle has already passed.

How Sutliff and Stout Manages the Evidence Window 

Hank Stout, co-founding partner at Sutliff and Stout, treats the first two weeks after a Houston car wreck as the most critical phase of the entire case. The firm’s engagement process is built around evidence preservation as the first priority, before settlement discussions, before damages calculations, and before any contact with the opposing carrier.

Legal hold letters go to the at-fault driver and their insurance carrier, any employer whose employee was operating the vehicle, any commercial fleet company involved, and all identified property owners along the crash corridor whose cameras may have captured the incident. The Houston Police Department crash report under Texas Transportation Code Section 550.065 is requested immediately. All witness contact information gathered at the scene is secured. Medical record requests go to every treating provider from the date of the crash forward.

For commercial vehicle crashes, FMCSA records requests are initiated for the carrier’s safety inspection history, the specific driver’s qualification file and hours-of-service records, and any prior federal safety violations associated with the carrier or the specific vehicle involved in the crash.

The Spoliation Doctrine and What It Means When Evidence Is Destroyed 

Texas law recognizes the doctrine of spoliation, the deliberate or negligent destruction of evidence that a party knows or should know is relevant to pending or foreseeable litigation. When a carrier or at-fault party destroys evidence after a legal hold letter has been received, the court may instruct the jury that it is permitted to draw a negative inference from the destruction. In some cases, sanctions, including dismissal of defenses, are available.

A car wreck evidence attorney from Houston from Sutliff and Stout, who identifies spoliation of evidence, converts a potential loss into a litigation advantage. The same data that would have supported the damages case, if it had existed, becomes evidence of misconduct when it has been destroyed after a legal hold was in place.