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Cellebrite and GrayKey Expert Witness
Forensic tools can extract and present data, but expert interpretation is still required. The legal question is whether the acquisition, interpretation, and resulting opinions are reliable and properly limited.
⚖︎Led by Daniel B. Garrie, Esq. — Founder, Law & Forensics · Neutral, JAMS · Faculty, Harvard · retained or court-appointed in 100+ disputes. Same-day conflict checks on most new matters, capacity permitting.
Our approach is neutral and professional. We do not attack tools or vendors. Cellebrite, GrayKey, and similar tools are widely used and capable. The question is not whether the tool works — it is whether the acquisition, interpretation, and conclusions in a specific matter are sound and properly bounded.
What We Evaluate
The factors that determine reliability
A tool-generated report is a starting point. These factors determine whether its conclusions can be relied upon.
Extraction type
Logical, file system, and physical extraction distinctions — and what each reaches.
Tool version
The specific tool and version, and known behavior or limitations at that version.
Device state
Locked, encrypted, jailbroken, or rooted — and the effect on the extraction.
Encryption & locking
How the device’s security posture shaped what was obtainable.
Parsed vs. unparsed
Whether artifacts were automatically parsed, manually interpreted, or left raw.
Unsupported artifacts
Data the tool did not natively support — and how it was handled.
Timestamp handling
Time-zone normalization and consistency across sources.
Report limitations
Whether the report states its own limits and assumptions.
Examiner assumptions
Inferences the examiner made beyond what the data shows.
Validation & reproducibility
Whether the findings can be independently validated and reproduced.
Affirmative & Rebuttal
Your extraction or theirs
An engagement can run in either direction, and the two are not the same work. In an affirmative role, the examination begins with your own extraction — a Cellebrite UFDR or a GrayKey acquisition produced in discovery — and interprets what it contains: identifying what was and was not extracted, explaining the artifacts, and preparing findings for declarations and testimony.
In a review role, the same discipline is turned on an opposing examiner's report, testing whether its acquisition, interpretation, and conclusions are sound and properly bounded. Both roles draw on the same method; they differ only in whose work product is under examination.
- Interpret a UFDR or GrayKey extraction produced in your matter
- Identify what the tool did and did not extract
- Explain the artifacts and their limits in plain terms
- Prepare findings for declarations and testimony
- Distinguish this affirmative work from rebuttal review of an opposing examiner's report
From Our Insights
Related reading
Authentication
Metadata: The Forensic Backbone of Digital and Mobile Evidence
Read the analysis →Preservation
Building ESI Protocols That Survive Mobile and Cross-Platform Data
Read the analysis →Preservation
Preserving Mobile and Digital Evidence: Avoiding Spoliation and Defending the Chain of Custody
Read the analysis →FAQ
Frequently asked questions
Is Cellebrite or GrayKey data admissible in court?
The output of a forensic tool is not automatically admissible. Admissibility turns on authentication, the reliability of the method, chain of custody, and proper interpretation — which is what an independent review evaluates.
Are Cellebrite and GrayKey reports always accurate?
They are capable tools, but reports can contain parsing errors, mislabeled timestamps, or data presented without context. The extraction type, tool version, and device state all affect what a report can reliably show.
What do you review in a Cellebrite or GrayKey report?
Extraction type (logical, file-system, or physical), tool and version, device state, parsed-versus-unparsed data, timestamp handling, validation, and whether the conclusions are reproducible from the underlying data.
Can you serve as a Cellebrite expert witness for our own extraction?
Yes. The role is not limited to rebuttal review of an opposing report. When a Cellebrite or GrayKey extraction is produced in your own matter, the work can include interpreting that extraction, explaining what it does and does not show, and providing affirmative declarations and testimony bounded to what the data supports.
Review a Cellebrite or GrayKey Report
Have a tool-generated extraction or report?
Send the non-confidential details for a neutral review of acquisition, interpretation, and reliability.
Submitting a request does not create an attorney-client, expert, or consulting relationship. Do not send privileged or confidential materials until a conflict check is complete and an engagement agreement is in place.