United States v. Williams

The court’s reasoning

The court followed circuit authority permitting a software company employee to explain how software operated without expert qualification, given the prevalence of computer technology. The investigator did not write the program and did not opine on the machine's inner workings; reading the extraction report requires only the knowledge of a reasonably tech-savvy lay person. The court noted that every circuit to address whether Cellebrite evidence requires expert testimony had answered no, and that the district court permitted voir dire on the specialised-knowledge question.

From the opinion

“he explicitly disclaimed that he was offering expert testimony. This is the antithesis of Rule 702's requirement of 'scientific, technical, or other specialized knowledge.'”

Grounds argued

This ruling turned on 2 of the eight arguments that recur across the docket. Each is defined the same way on every entry, so the same ground can be followed across rulings that reached opposite results.

Qualifications

Whether this witness — by training, certification, or documented casework — is competent to give this opinion. Courts routinely admit examiners qualified by experience alone, and routinely narrow them when the opinion strays past the experience they described.

Tool reliability

Whether the software or hardware used — an imaging tool, a carving engine, an extraction platform — produces accurate results, and whether the examiner can say how that is known. Courts rarely require a tool to be validated from first principles, but they do expect the examiner to know its limits.

Practice note

Terms used on this page

Every term below is defined in the forensic glossary — what it is, why a case turns on it, and what happens in the matter when it is mishandled.

• FRE 702
• VOIR DIRE

Rulings on the same grounds

One ruling is not a rule. These are the other entries in the docket argued on the same grounds, most-cited first — including the ones that came out the other way, which are the ones worth reading before relying on this entry for anything.

• The Daubert Docket

  All 55 rulings, filterable by ground, outcome and court, with the distribution across the three outcomes reported up front.

• Daubert and digital evidence

  The argument this docket is the evidence for: why an opinion stated one level too strongly is an admissibility problem under Rule 702(d).

• Daubert Exposure Check

  Twelve questions about an expert's methodology, mapped to the failure modes these rulings keep finding, with the remediation for each gap.

• Daubert or Frye?

  Which reliability test your forum applies — settle that before relying on a ruling from another jurisdiction.

← BACK TO THE DAUBERT DOCKET

Attorney advertising / expert services. Each entry summarises a decision as it appeared in the opinion linked from that entry, on the day the entry was written. Decisions are reversed, vacated, superseded, and distinguished, and the text of Federal Rule of Evidence 702 was itself amended effective 1 December 2023 — check the current status and subsequent history of any ruling before relying on it. Nothing here is legal advice, none of it is a prediction about how any court will rule, and it is not a substitute for the rules, standing orders and case law of your own forum.