Digital Forensics, Expert Reports and Courtroom Testimony
Digital Forensics Expert Witnesses Accepted by Federal and State Courts
When the case turns on what a laptop, a phone, a mailbox or a cloud account recorded, you need an expert who can find the evidence, explain it in plain English and defend every opinion under cross examination. Global Digital Forensics examiners preserve and examine the devices and accounts themselves, tie every finding to a record the other side can inspect and deliver the report, the declaration and the testimony. They have testified in federal and state courts, and the first consultation is free.
Why Litigation Counsel Retain Global Digital Forensics to Testify
An expert is only as useful as the worst five minutes of their cross examination. Our examiners have testified in federal and state courts, and every opinion they give rests on an examination they performed themselves and a record the other side can inspect. In COMLAB v. Kal Tire, the United States District Court for the Southern District of New York accepted Joseph Caruso as an expert in computer forensics and computer science, described his testimony as reasonable, logical, and ultimately highly credible, and found by clear and convincing evidence that the opposing party had fabricated the disputed emails and then destroyed the native evidence to hide it.
That is the standard we bring to every assignment. We identify the factual question, the platform, the authorized sources and the period, preserve the records and the workpapers that connect each observation to a finding, and write for the reader who has to rule on it. A missing record is tested against the retention settings before anyone calls it spoliation, and an account event is traced through devices and sessions before anyone names a person, so the report sets out the alternative explanations it ruled out and the assumptions it relied on.
The method draws on NIST IR 8354, Digital Investigation Techniques: A NIST Scientific Foundation Review and the current Federal Rules of Evidence for the technical and evidentiary background behind our reports.
If opposing counsel has already signaled a challenge to your expert’s method, request a briefing and we will tell you what the record can support before you file.
Who retains our digital forensics expert witnesses
- Litigation counsel at AmLaw 100 firms
- General counsel
- Fortune 1000 corporations
- Insurers and coverage counsel
- Government agencies
Scope
Examinations and Testimony for Phone, Computer, Email and Cloud
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Mobile Device Forensics
We extract and examine phones and tablets for messages, including recoverable deleted messages, location artifacts, application records and media. Veronica Perez, Senior Computer Forensic Specialist, does this work and has been designated as a digital forensics expert witness in California, Oklahoma and South Carolina state courts and in federal court in Chicago.
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Computer and Email Forensics
We image workstations, servers and mailboxes and authenticate disputed email from original messages, headers and account records, and we test document metadata against the claimed history of each file.
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eDiscovery Support
We collect, process and produce electronically stored information to the agreed ESI protocol and load file specification, so the production arrives ready for review and can be defended if it is challenged.
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Intellectual Property Forensics
We reconstruct how design files, customer lists and source code moved in trade secret, patent and departing employee matters, and we keep evidence of access distinct from evidence of copying or transfer.
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Electronic Exit Interviews
We preserve and review a departing employee’s devices and accounts before reissue or routine retention erases the record the case will need six months from now.
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Expert Witness Testimony
Reports, declarations, deposition and trial testimony come from the examiner who did the work. Global Digital Forensics has operated since 1992, and its expert practice spans federal district court, multidistrict litigation, arbitration and ITC Section 337 proceedings.
Engagements are routinely structured through outside counsel where privilege matters, and expert selection, availability and conflicts are confirmed during scoping.
Which examiner fits your matter depends on the evidence and the court. Call (800) 868-8189 and we will confirm availability and conflicts on the first call.
Methodology
From Forensic Collection to Courtroom Explanation
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Preserve the relevant records
We work with counsel on the preservation protocol and the holds, and we move first on the sources that ordinary business activity will change soonest: the laptop about to be reissued, the mailbox about to age out, the phone about to be replaced.
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Acquire documented forensic copies
Forensic copies are acquired with hash verification and custody documentation from the first minute, so the handling record is complete when the other side asks for it rather than reconstructed afterward.
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Examine the disputed activity
We test the disputed questions against the whole record, correlating device, account and cloud evidence to confirm or eliminate each explanation instead of resting an opinion on isolated search hits.
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Report the findings clearly
The report ties each finding to the record and the method behind it, in language a judge, a jury and an opposing expert can all evaluate, with the source of every finding stated on the page.
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Explain the findings in testimony
We prepare declarations, deposition and trial testimony with the litigation team, so the examiner who did the work is the one who explains it under oath.
Want to know what the first call covers? The digital forensics FAQ sets out cost, timing and deliverables in plain terms.
What the engagement delivers
Your Forensic Report and the File That Supports It
Every report is written for the moment it is challenged. Each finding is tied to a source artifact, and the engagement file records how the evidence was acquired, handled and examined.
The engagement file documents the method and the foundation needed to meet a Rule 702, Daubert or Frye challenge.
Need the scope letter before the retention is final? Send us the questions and the deadline and we will draft it.
- Scope letter and stated assumptionsThe scope letter records the questions, the material examined, the exclusions and the assumptions the retaining firm supplied.
- Evidence handling recordThe handling record documents acquisition details, integrity values, storage, transfer and custody for every evidence item.
- Methodology statementThe method statement identifies tools, versions and procedures so another qualified examiner can repeat or assess the analysis.
- Findings, separated from interpretationFindings distinguish observed facts from expert interpretation and identify the basis for each conclusion.
- Open items and further workThe report names any material still to be obtained and the specific work that would close each open question.
- Exhibits and supporting materialArtifacts, timelines and schedules become exhibits suitable for a filing, a hearing or a board presentation.
- Testimony supportWhere agreed, declarations and preparation for deposition and trial help counsel present the technical record and test the other side’s.
From the record
What a Federal Court Said About Our Testimony
In COMLAB v. Kal Tire, Kal Tire retained Joseph Caruso to examine the metadata of disputed emails and invoices and a claimed computer virus that supposedly destroyed the native evidence. He showed that the invoice metadata had likely been manipulated, that other documents had been altered during the same period and that server evidence existed which could have tested whether the emails were ever sent. The court found his experience impressive and his testimony reasonable, logical, and ultimately highly credible, concluded by clear and convincing evidence that the emails had been fabricated and the evidence spoliated, and dismissed the action with prejudice. Read the COMLAB v. Kal Tire case study.
The examiners
Joseph Caruso, founder, CEO and CTO, holds the CISSP and has been accepted as an expert in computer forensics and computer science in federal court. His technology career began in 1980, and his consulting expert work includes Motorola Mobility v. Microsoft and Apple v. Samsung.
Veronica Perez, Senior Computer Forensic Specialist and EnCase Certified Examiner, has been designated as a digital forensics expert witness in California, Oklahoma and South Carolina state courts and in federal court in Chicago, after fifteen years of police service in California.
Robert Knudsen, Computer Forensics and Cybersecurity Specialist, holds the CISSP and Certified Computer Examiner credentials, with eighteen years of forensic experience and hundreds of computer and mobile device examinations in federal and state court matters, following twenty years with the New York City Police Department.
Ask for a current CV and a conflicts check now; the full practitioner profiles are on our About page.
Additional context
Technical Expertise Behind the Testimony
Where the opinions come from, and what each kind of evidence can prove.
Three examiners behind the opinions
The practice’s testimony and consulting expert experience covers source code and patents, operating systems and mobile devices, cellular networks, mainframe and transaction databases, enterprise business systems and biometric privacy litigation, including Rogers v. BNSF Railway. Joseph Caruso brings engineering and systems analysis, Veronica Perez mobile and vehicle evidence, and Robert Knudsen computer forensics and cybersecurity. We can discuss which background fits the opinion the case needs.
Mobile, tablet and cloud evidence
Phones, tablets and their cloud accounts hold different parts of the same story. We examine messages, including recoverable deleted messages, chats, call logs, browsing history, media with EXIF metadata, application artifacts and location data, then correlate the device record with provider and cloud copies to corroborate the timeline. Locked devices receive a source specific feasibility assessment before anyone promises a result.
Email and message authentication
Authenticating a disputed email means comparing the original message, trusted header information and independent server, account or device records, the same metadata discipline a federal court credited in COMLAB v. Kal Tire. The collection record documents the method, the integrity checks and any known change to the source, so the authentication opinion stands on records the other side can test for itself.
Data exfiltration and departing employees
Trade secret and departure examinations follow cloud synchronization, webmail, USB history, document metadata and versions, obfuscation tools and chats. Preserving a workstation before it is reissued is the single step that most often saves the case. Remote, mobile and court directed collections, including difficult environments, follow the agreed custody protocol with access and safety arrangements confirmed for the source.
If your matter sits in one of these areas, describe the evidence and the court and we will match the examiner to it.
Frequently asked
Neutral Appointments, Preservation Speed and Daubert Reports
Can you serve as a neutral or court appointed examiner?
Yes. Global Digital Forensics serves as an agreed neutral examiner and accepts court appointed examinations under a defined protocol for communications, evidence handling and reporting, so both sides and the court work from the same record.
How quickly can you preserve evidence?
Call the 24/7 hotline at (800) 868-8189 and tell us what is at risk: a laptop about to be wiped or reissued, a mailbox aging out, logs about to expire. We confirm lawful authority, access, method and examiner availability, then arrange authorized on site collection or secure shipment within the agreed scope.
How do you prepare a report for a Daubert or Frye challenge?
We build the foundation the challenge will test: documented methods, tool versions, hash values and custody, findings tied to their source artifacts and an examiner whose qualifications and testimony history fit the assignment. Counsel goes into the Rule 702 hearing with the documented basis for each opinion.
Talk with an examiner
Start the technical record before the disclosure deadline
Tell us the systems, evidence and deadline. We can review relevant experience, potential conflicts and the scope before engagement.
GDF has operated since 1992 and provides court tested forensic expertise.
Talk with an examiner
Retain a Digital Forensics Expert Who Can Explain the Evidence
Describe what the devices and accounts are expected to show. A senior examiner flags the sources most at risk of being overwritten and matches the examiner whose background fits the evidence and the court, and that first consultation is free.
Our 24/7 hotline is (800) 868-8189.
Expert witness services by evidence and technology
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 .