United States v. Wehrle
United States v. Lance Wehrle, 985 F.3d 549 (2021). Decided in 7th Cir..
- COURT
- 7th Cir.
- DECIDED
- 2021
- CITATION
- 985 F.3d 549
- OUTCOME
- Admitted
- STANDARD
- Daubert / Rule 702
- CITED BY
- 21 later opinions (CourtListener)
Testimony about the technical aspects of a digital forensic examination — write-blocking, hash values, and metadata — is specialised knowledge within Rule 702, so admitting it without formally qualifying the witness as an expert was an abuse of discretion. The error was harmless and the conviction was affirmed, so the testimony stood.
Every entry in this docket was written from the opinion itself, and this is the copy that was read. If the opinion does not support what is written here, the entry is wrong — tell us and it will be corrected or removed rather than softened.
READ THE OPINIONUnited States v. Wehrle, 985 F.3d 549↗COURTLISTENER · FREE LAW PROJECT · OPENS IN THE SAME TAB
The court’s reasoning
A forensic examination process falls within Rule 702 where it involves specialised knowledge that assists the trier of fact. The court accepted that not all testimony about technical equipment implicates Rule 702, and that a lay person may follow any one of these concepts in isolation, but held that explaining how they work together to preserve the integrity of the data crosses into Rule 702 territory. A dissent noted tension with decisions in other circuits holding that mere extraction of cell-phone data requires no expert certification.
From the opinion
“Admitting her specialized knowledge without formally qualifying her as an expert witness was an abuse of discretion.”
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.
- Methodology
- Whether the steps the examiner took are a recognised way of answering the question asked, and whether they were followed as described. Most digital-forensics rulings turn on this rather than on anything the field would call science.
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.
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.
ON QUALIFICATIONS
- Kumho Tire Co. v. Carmichael 526 U.S. 137 (1999) EXCLUDED
- Wellogix v. Accenture 716 F.3d 867 (2013) ADMITTED
- Krause v. State 243 S.W.3d 95 (2007) ADMITTED
- United States v. Chiaradio 684 F.3d 265 (2012) ADMITTED
ON METHODOLOGY
- Daubert v. Merrell Dow Pharmaceuticals 509 U.S. 579 (1993) ADMITTED
- Kumho Tire Co. v. Carmichael 526 U.S. 137 (1999) EXCLUDED
- General Electric Co. v. Joiner 522 U.S. 136 (1997) EXCLUDED
- Wellogix v. Accenture 716 F.3d 867 (2013) ADMITTED
If an opinion in your case has to survive the argument this ruling turned on — or you need one tested before it is served — Law & Forensics retains court-tested digital forensic expert witnesses and forensic neutrals.
A conflicts check and scoping call follow, normally within one business day. Please do not send privileged or case-sensitive material until conflicts have cleared.
- 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.
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.