A Strategic Guide for Attorneys in Commercial Vehicle Crash Cases
One of the most consequential decisions an attorney makes in a commercial vehicle crash case is how far back to pull the cell phone records. It sounds like a procedural detail. In practice, it can make a tremendous difference in the outcome of the case.
Call Detail Records are the backbone of cell phone evidence in litigation. They are carrier generated, they cannot be altered by the user, and they capture a level of objective detail that no witness testimony can match. But CDRs are only as useful as the time window you request. Ask for too little and you miss the pattern. Ask for too much and you invite a fight that slows everything down and may ultimately be limited by the court anyway.
In our recent LinkedIn poll, we asked attorneys how far back they pull CDRs to establish a pattern of distracted driving in a commercial vehicle crash case. The four answer choices were:
- One hour before and after the crash
- Thirty days prior
- Ninety days prior
- One year prior
Every single one of those answers is correct under the right circumstances. The question is which one is right in your case, and understanding the advantages and disadvantages of each will help you make that call with confidence.
1. One Hour Before and After the Crash: Immediate Context, Immediate Limitations
There are cases where one hour before and after the crash is exactly what you need. If your primary goal is to prove that the driver was actively on a call or engaged with their phone at the precise moment of impact, a narrow CDR window focused on the crash window is clean, targeted, and hard to argue against in discovery.
Advantages:
A narrow request is unlikely to generate significant opposition from the defense. It is easy to justify in court, and it is easy to explain to a jury. If the records show an active voice call or an outbound text message in the minutes leading up to the crash, that narrow window may be all you need to establish liability for distracted driving.
Disadvantages:
The limitations of a one-hour window become clear the moment you need to do anything beyond proving immediate distraction. You cannot establish a pattern of habitual phone use. You cannot show a driver exceeding his or her driving hours. You cannot show that the employer knew or should have known about the driver’s phone habits. And critically, you may miss evidence that is no longer on the phone itself.
This last point deserves more attention than it usually gets. I worked a case recently where the phone produced in discovery showed a very limited record of activity around the time of the crash. From a forensic standpoint, something was wrong. The pattern of data on the device was inconsistent with normal phone usage, and we had reason to believe the phone had not been properly preserved after the incident. Our theory was that calls and messages had been deleted from the device after the preservation letter had been sent, and we wanted to use the carrier records to prove it by showing activity in the CDRs that simply did not appear anywhere on the phone itself.
The problem was that the CDR window we had received was too narrow. The records we had did not go back far enough to show the full scope of the discrepancy between what the carrier logged and what appeared on the device. We could see the gap, but we could not prove its full significance without a longer record. It was a hard lesson in why the scope of your CDR request matters as much as the request itself.
2. Thirty Days Prior: Establishing Recent Habit
Pulling thirty days of CDRs before the crash is the most common approach among experienced attorneys, and for good reason. Thirty days is long enough to establish a meaningful pattern of behavior, short enough to be proportionate under most discovery standards, and unlikely to generate the kind of aggressive opposition that longer requests often trigger.
Advantages:
Thirty days of records can show a consistent pattern of phone use while driving. If the driver was regularly making calls, sending texts, or engaging with data heavy apps during driving hours in the month before the crash, that pattern directly supports a negligence argument and begins to lay the groundwork for a gross negligence theory. It also gives you enough data to cross reference with the driver’s hours of service logs and dispatch records, which can reveal whether phone activity was happening during active driving shifts rather than rest periods.
Thirty days is also a practical window for addressing the spoliation issue described above. If you have reason to believe a phone was not properly preserved, thirty days of carrier records gives you a much broader baseline to compare against the device itself. Discrepancies between what the carrier logged and what appears on the phone become far more visible and far more compelling when you have a full month of data to work with rather than a single hour.
Disadvantages:
Thirty days may not be enough to support the most aggressive liability theories. If you are pursuing punitive damages based on a longstanding pattern of reckless behavior, or if you are trying to establish that the employer had actual or constructive knowledge of the driver’s phone habits, thirty days of records may fall short. It captures recent behavior, but it does not necessarily capture the full scope of a long-term problem.
3. Ninety Days Prior: Building the Gross Negligence Case
When punitive damages are on the table, ninety days is where the conversation usually starts. Three months of CDR data gives you enough history to move beyond “this driver made a mistake” and into “this driver had a documented, habitual pattern of dangerous phone use that the employer either knew about or deliberately chose not to address.”
Advantages:
Ninety days of records can turn a straightforward negligence case into a gross negligence case. If the driver consistently used the phone during driving hours, especially for calls with the employer, over a three-month period, the issue is no longer a single moment of inattention. It becomes a documented pattern of conduct that may show conscious disregard for the safety of others and employer awareness of the risk. That is the foundation for a punitive damages claim, and it is difficult for the defense to overcome when the carrier records tell the story.
Ninety days also gives you significantly more data for the spoliation analysis. If there is a meaningful gap between what the carrier logged and what appears on the device, three months of discrepancies is far more convincing than thirty days. It moves the conversation from “something may have been deleted” to “a substantial volume of data is missing from this device and the carrier records prove it.”
Disadvantages:
The defense will fight a ninety-day request harder than a thirty-day request. Expect proportionality arguments, privacy objections, and motions to limit the scope of discovery. You will need to be prepared to justify the request with specific factual support for why the broader window is relevant to your theory of the case. Courts vary significantly in how they handle these disputes, and without a clear and articulate justification for the longer window, you risk having the request narrowed before you ever see the records.
4. One Year Prior: Maximum Retention, Maximum Resistance
Carriers like Verizon retain CDR data for up to one year, which means a one-year request captures the maximum available window of carrier data. For the right case, this is an extraordinarily powerful discovery tool. For the wrong case, it is an invitation to a discovery battle that consumes time and resources without a proportionate return.
Advantages:
A full year of CDR data is the gold standard for establishing long term habitual behavior and corporate knowledge. If a driver has been routinely using their phone during driving hours for twelve months and the employer has not intervened, you have a compelling argument that the company knew or should have known about the problem and chose to do nothing. That is the kind of evidence that supports not just punitive damages but potentially a finding of corporate ratification of dangerous conduct.
A one year window is also the most comprehensive tool available for proving spoliation. If you have reason to believe that data was deleted from a device after the crash, a full year of carrier records gives you the broadest possible baseline to compare against what actually appears on the phone. Gaps that might look incidental in a thirty-day window can look systemic and deliberate across a full year of data.
Disadvantages:
The opposition will protest a one year request vigorously, and they will have arguments on their side. Privacy concerns, proportionality objections, and relevance challenges are all legitimate tools the defense can use to narrow the scope of your request. Courts are generally more sympathetic to broader discovery requests when you can show a specific factual basis for the broader window, but without that foundation, a one-year request can look like a fishing expedition even when it is not.
It is also worth noting that carrier data retention policies vary. While Verizon retains CDRs for up to one-year, other carriers have different retention periods. T Mobile, AT&T, and smaller regional carriers each have their own policies, and some data types, such as cell site location information for, are retained for very different periods. Always confirm the specific retention policies for the carrier involved and consult and expert before structuring your request.
Tips for Attorneys: Getting the Most Out of Your CDR Request
- Match the window to your theory of liability. If you are pursuing punitive damages or corporate negligence, ask for ninety days or more and be prepared to justify it. If you only need to prove immediate distraction, a shorter window may be all you need and will face far less resistance.
- Always compare CDRs against the device. If you receive a forensic image of the phone, compare it carefully against the carrier records for the same time period. Discrepancies between what the carrier logged and what appears on the device are among the strongest indicators of spoliation available in modern litigation.
- Request CDRs early and broadly, then narrow if needed. It is far easier to narrow the focus on a broad request after receiving records than to go back to the carrier for an additional window after the fact. Request the broadest window you can justify at the outset.
- Be specific about what you are requesting. CDRs can include call records, text message metadata, data connection logs, and cell tower location information. Make sure your subpoena or discovery request specifically identifies each category of data you need. A generic request for “phone records” may not capture everything that is available. Consult an expert to help you articulate what you are looking for.
- Confirm the carrier’s retention policy before you file. There is nothing more frustrating than winning a discovery dispute over a one-year request only to learn that the carrier purged records beyond six months. Know the retention landscape before you structure your request.
- Anticipate the proportionality argument. Courts increasingly evaluate discovery requests under a proportionality standard. Be prepared to articulate exactly why the time window you are requesting is relevant to your specific theory of liability. The more specific your justification, the harder it is for the defense to challenge.
- In criminal defense, use CDRs to challenge the prosecution’s timeline. The same strategic thinking applies in criminal cases. A narrow CDR window may be enough to establish an alibi for a specific moment, but a broader window can reveal patterns of behavior that contradict the prosecution’s overall narrative. But use caution. The records can cut both ways
Conclusion: The Right Window Makes All the Difference
There is no universally correct answer to how far back you should pull CDRs. The right window depends on your theory of liability, the damages you are pursuing, the facts of the specific case, and your willingness to fight for broader discovery when the circumstances justify it.
What I can tell you from experience is that attorneys who think strategically about their CDR requests, who match the scope of the request to the demands of the case and who understand both the advantages and the limitations of each time window, are the attorneys who get the most out of this evidence. And sometimes, as I learned firsthand in the case where our CDR window was too narrow to prove the spoliation we suspected, the difference between the right window and the wrong one is the difference between proving your case and coming up just short.
Pull the records. Pull them early. And pull enough of them to tell the whole story. If you are an attorney and have any questions, or would like the preservation/subpoena language for the major cell phone carriers, please contact me at ben@braveinnvestigations.com.