Los Angeles Expert Reports, Rebuttal Analysis and Testimony
Opinions Traced to the Artifact, Defended From the Stand
Most Los Angeles digital evidence disputes come down to one narrow question: did the file exist, move, open or merely sync on the date that matters? Global Digital Forensics answers it with an opinion tied to identified artifacts, documented methods and the alternatives we ruled out. Our examiners write the report, build the exhibits and defend the work at deposition and trial, and they have been designated as experts in California superior courts and in federal court.
The engagement
Test the Opinion Before the Other Side Does
Call the Los Angeles office at (310) 694-3094, or the 24/7 hotline at (800) 868-8189, with the disputed proposition and the next date on the calendar. A fight over a project file, a recording or an employee account usually turns on a narrow technical point. Did the file exist at a particular time? Was it transferred, opened or merely synchronized? We separate those propositions and examine the evidence each one needs, because an opinion that answers the wrong question gets no better on the stand.
An expert review starts with the acquisitions, the source records and any prior examination work. Screenshots make useful exhibits, but the opinion rests on the underlying data: collection completeness, time normalization and tool behavior are checked at the source, and anything the other side has not produced goes on a written request list. That groundwork is what holds under cross examination.
We prepare opinions for the Central District of California, the Los Angeles County Superior Court and arbitration, on the schedule and under the orders each forum sets, and our experience runs through federal district court, multidistrict litigation and ITC 337 proceedings. In federal court, Rule 702 as amended in 2023 asks the proponent to show that an opinion rests on sufficient facts and a reliable application of method; our workpapers document exactly that.
Does the opposing opinion rest on screenshots? Send the report and the schedule and we will tell you what an independent review can reach.
Scope
Independent artifact review
We compare the source data, the acquisition records and the examination outputs, check the tool settings that matter and confirm the method addresses the question actually in dispute.
Opinion and report preparation
We separate observation from inference, explain the alternative interpretations and the missing records, and state the boundaries of the analysis in plain terms.
Technical exhibits and testimony
We prepare traceable exhibits and explain the method in language a judge or jury can follow. Deposition and trial testimony are included when the engagement calls for them.
Evidence commonly reviewed
The Record Behind Every Opinion
We review the forensic acquisitions with their collection notes and integrity records, the project versions, file system artifacts, account logs and communications behind the dispute, and any existing reports together with the examination settings and the source records behind the exhibits they rely on.
What you receive
What Counsel Receives Before Disclosure
You receive a technical report linking each material finding to identified evidence, an explained timeline that states the source clocks, the time zones and the unresolved gaps, and the supporting exhibits and scoped preparation for deposition or trial.
Deposition and trial preparation are scoped from the start, so call (800) 868-8189 with the next date on the calendar.
The Examiner Who Signs the Report Takes the Stand
Veronica Perez, our Senior Computer Forensic Specialist, has been designated as a digital forensics expert witness in California superior courts, as well as in Oklahoma and South Carolina state courts and in federal court in Chicago. Before private practice she served with the Los Angeles School Police Department from 2001 to 2007 and the West Covina Police Department from 2007 to 2016, and she has instructed examiners for the California Department of Justice Advanced Training Center. Her custody habits were formed in Los Angeles County and have been tested in California courtrooms.
Robert Knudsen brings eighteen years of forensic experience and hundreds of computer and mobile device examinations in federal and state court matters, and Joseph Caruso, our founder, has served as a consulting expert in patent litigation and class actions involving mobile technology, mainframe databases and source code. Their credentials and matter experience are set out on the About page, and the proposed expert’s CV is available to the retaining firm before the engagement begins.
Every opinion is tested against how the system actually behaves. A cloud sync can place a file on several devices without anyone copying it, and a timestamp can record an application operation rather than the moment a witness describes. We reproduce that behavior, keep the basis for each opinion in the workpapers, explain the method and its validation, and rule shared accounts and automated processes in or out before the report is signed. Request a free consultation with a nonconfidential summary, the party names for conflict review and the opinion deadline.
Frequently asked
What Los Angeles Litigators Ask Before Retaining an Expert
Can you assess an existing expert report?
Yes. A full review covers the underlying data, the acquisition records and the methods, not just the written report. Where the other side has not produced the material its expert relied on, we draft the request so the review can reach it.
Does an account login identify a person?
A login identifies an account. Shared access, delegated permissions and automated activity are examined next, and device and session records usually decide between the explanations. We run those alternatives down before anyone names a person.
Has your work been accepted by courts?
Yes. Our examiners have testified in federal and state courts and our work has been accepted by courts. Every opinion we offer is traceable to the evidence behind it, which is precisely what an admissibility challenge tests.
Los Angeles Practices Beside Expert Testimony
Bring Us the Technical Question and the Expert Deadline
Start with the proposition in dispute, the evidence available and the next date on the schedule. Keep the first note nonconfidential so conflicts, scope and evidence handling are settled before anything privileged moves.
Connect the Source Records to the Opinion You Need
For a disputed project or media file, provide the preserved native version, the linked assets, the rendered output and the opposing account of how it was created or altered. Tell us whether the opinion concerns authorship, timing, access or file consistency, because the examiner should be selected for those formats and methods rather than for a general credential.
The workpaper for a disputed project file shows its preserved version, its synchronization history, its access record and any linked source still outstanding. A matching hash proves the bytes are identical; authorship and version history come from the project metadata and the sync record, and the workpaper carries both.
We scope the examination, the report, any rebuttal and the testimony as distinct pieces of work, so the engagement grows only as the matter does. The workpapers record the sources examined, the method and tool versions, the observations, the inferences and the validation behind them, and we confirm travel, remote appearance, exhibit format and expert availability against the scheduling order.
Examiner biographies and credentials · Federal Rules of Evidence, current edition
Read the national expert witness page for the method behind every opinion, then bring the Los Angeles venue and the deadline to us.
Talk with an examiner
Test the Opinion Before You Rely on It
Name the proposition in dispute, the evidence you hold and the expert deadline. A senior examiner will come back on conflicts, scope and which examiner fits, in confidence.
Since 1992 · Los Angeles office (310) 694-3094 · Testified in federal and state courts
One call away
Retain the Examiner Who Will Defend the Finding
On the first call a senior examiner hears the disputed point, tells you what the evidence can likely reach, names the examiner suited to it and maps the work against your disclosure dates. The consultation is free and confidential.
24/7 hotline: (800) 868-8189
GDF does not accept pro se litigation cases, and GDF may decline matrimonial or family law cases at our discretion.
Reviewed by Joseph Caruso, Founder, CEO and CTO, CISSP. Last reviewed .