Renewing Rule 29 Motions to Preserve Sufficiency Claims and Treating Digital-Forensics Disputes as Weight (Not Admissibility)
Introduction
In United States v. Scott Nelson (6th Cir. July 29, 2026) (unpublished), the Sixth Circuit affirmed a conviction for
possession of child pornography under 18 U.S.C. § 2252A(a)(5)(B), (b)(2) after probation officers discovered an explicit video
on Nelson’s Alcatel flip phone during a compliance check. Nelson—whose probation conditions authorized warrantless searches—admitted the phone
belonged to him but denied knowledge or ownership of the video.
On appeal, Nelson raised three main issues: (1) insufficiency of the evidence of “knowing” possession; (2) erroneous admission of digital
forensic evidence (thumbnails, cached data, and Cellebrite extraction results) under Rules 401, 403, and 702; and (3) improper denial of a
proposed theory-of-defense jury instruction.
Although the panel ultimately applied established doctrine rather than announcing a dramatic new rule, the opinion is significant for how
forcefully it reiterates two practical appellate constraints: failure to renew a Rule 29 motion narrows sufficiency review to “manifest
miscarriage of justice,” and unpreserved evidentiary attacks on technical digital proof will almost never satisfy plain-error
review—especially when the dispute is really about the inference of knowledge rather than the reliability of expert methods.
Summary of the Opinion
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Sufficiency: Because Nelson did not renew his Federal Rule of Criminal Procedure 29 motion at the close of all evidence, the
court reviewed only for “manifest miscarriage of justice” and held the record was not “devoid of evidence pointing to guilt.” Ownership and
registration of the phone, sequential file naming, and timing evidence supported an inference of knowing possession.
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Digital forensic evidence: With no trial objections, review was for plain error. The evidence was relevant under Rule 401 and
not unfairly prejudicial or confusing under Rule 403. Rule 702 did not apply because Nelson did not challenge expert methodology; he
challenged the prosecution’s “inference chain.”
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Theory-of-defense instruction: The district court’s instruction substantially covered the defense’s legal theory (lack of
proof of knowing possession). The excluded language was largely factual argument, which the court was not required to instruct upon.
Analysis
Precedents Cited
1) Sufficiency of the Evidence and Preservation (Rule 29)
The opinion begins with the ordinary sufficiency framework: de novo review asking whether, viewing evidence favorably to the prosecution, “any
rational trier of fact” could find guilt beyond a reasonable doubt—drawn from United States v. Ray and
United States v. Pritchett, which in turn quote Jackson v. Virginia.
The decisive move, however, is procedural. Relying on United States v. Curry and United States v. Sherman, the
panel restates a strict preservation rule: a defendant who moves for acquittal at the close of the government’s case-in-chief and then presents
evidence must renew the motion “at the close of all the evidence.” If not, review is limited to “manifest miscarriage of justice,” as described
in United States v. Page—requiring a showing that the record is “devoid of evidence pointing to guilt.”
The opinion’s application is instructive because the trial judge invited a renewed motion and defense counsel declined. That fact pattern
underscores the Sixth Circuit’s willingness to enforce preservation doctrine when the opportunity to preserve was clear on the record.
2) Proving “Knowing Possession” Under § 2252A
For the statutory elements, the court quotes United States v. Ammons. On the knowledge component, the panel relies on
inferential proof: possession of contraband on a personal device can support an inference of knowing possession. The court cites
United States v. Preston (quoting United States v. Oufnac) for the proposition that where pornography is in a
defendant’s files, “the jury may infer” knowing possession. It contrasts this with United States v. Lowe, where access by
roommates made that inference too speculative.
The panel also invokes United States v. Rogers for the familiar point that circumstantial evidence can be enough for conviction.
When Nelson argued that “file presence alone” is insufficient—especially where files are not accessible—the panel distinguished cases where files
were in obscure system areas: United States v. Keefer (images in “unallocated space”) and United States v. Dobbs
(automatic caching), explaining that Nelson’s video was stored in a phone application rather than in an unfamiliar or inaccessible location.
Finally, when Nelson attempted to pit his expert against the government’s experts, the court framed that as a credibility/weight dispute, not a
sufficiency defect, citing United States v. Baskerville (credibility is not sufficiency) and
United States v. Ledbetter (credibility determinations belong to the jury).
3) Evidentiary Review: Rules 401, 403, 702, and Plain Error
Because Nelson did not object, the panel applied plain-error review under United States v. Wilder (and noted the usual
abuse-of-discretion standard from United States v. Sadler). This framing is pivotal: without preservation, Nelson had to show an
obvious error affecting substantial rights and the integrity of proceedings—an exceptionally hard hurdle in evidentiary disputes involving
arguably probative digital data.
Rule 401 (relevance): The panel recited the low threshold for relevance and relied on United States v. Hazelwood
(fact of consequence in criminal cases) and United States v. Betro (“advances the ball one inch”), as well as
United States v. Lester (relevant evidence admissible unless excluded by another rule). The extraction reports, file dates,
naming conventions, the thumbnail, and contemporaneous personal photos were all held relevant to knowledge and possession.
Rule 403 (unfair prejudice/confusion): The panel emphasized Rule 403’s pro-admission tilt via United States v. Asher
and “broad discretion” language from Wilder. It applied the Sixth Circuit’s definition of unfair prejudice from
Hazelwood and rejected Nelson’s “aura of specificity” argument, citing United States v. Smith (probative damage
is not unfair prejudice) and United States v. Clark (highly probative evidence on a crucial issue with limited prejudicial
effect is admissible).
Rule 702 (expert testimony): Here the court drew a categorical boundary: Rule 702 governs the admissibility of expert testimony,
not attacks on the prosecution’s inferential use of otherwise admissible technical facts. The panel cited
United States v. Ganier and United States v. Beverly as examples of Rule 702’s proper domain. Because Nelson did
not identify unreliable principles or methods and did not mount a targeted methodological challenge to the experts, Rule 702 did not provide a
vehicle for exclusion.
4) Theory-of-Defense Instructions: Law vs. Factual Argument
The panel briefly addressed procedural defenses (waiver/invited error/forfeiture), referencing United States v. Carter
(definition of waiver), United States v. Fowler (explicit concession), and United States v. Montgomery
(agreement alone does not necessarily equal waiver). It ultimately found no need to resolve the dispute, citing
United States v. Akridge for deciding the claim fails under any standard.
On the merits, the controlling test came from United States v. Blanchard: a refusal to give a proposed instruction is reversible
only if the instruction is correct, not substantially covered, and vital to the defense. The panel stressed that courts need not instruct on a
defendant’s “view of the facts,” citing Blanchard and United States v. Chowdhury. It then treated Nelson’s
proposed language (e.g., that the proof does not suggest he recorded the video or knew it was on the phone) as factual advocacy rather than a
legal principle, relying on United States v. Vassar.
Legal Reasoning
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Preservation narrows the appellate lens: By declining to renew Rule 29, Nelson voluntarily accepted a far more demanding
standard. Under “manifest miscarriage of justice,” the question is not whether the government’s case was strong, but whether it was
essentially nonexistent on the knowledge element.
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Knowledge can be inferred from device ownership plus contextual metadata: The court treated ownership/registration of the phone
as the foundation and then layered on corroborators: file naming sequence, creation date, and proximity to other personal files. Those facts
support a rational inference that the illicit file was part of Nelson’s own use of the device rather than an unexplained artifact.
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Technical ambiguity is ordinarily for the jury: Thumbnail-creation timing and “garbage collection” were presented as competing
expert narratives. The court refused to convert that clash into a sufficiency reversal or an evidentiary exclusion argument, characterizing it
as weight/credibility.
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Rule 702 is not a backdoor to suppress inferentially powerful digital facts: The panel’s Rule 702 discussion signals that to
invoke Daubert-style reliability scrutiny, a defendant must actually challenge expert principles/methods, not merely argue that the jury might
draw an overconfident inference from technical evidence.
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Theory-of-defense instructions must remain legal, not argumentative: The district court gave the legally relevant core (the
government failed to prove knowing possession beyond a reasonable doubt). It properly excluded a narrative of “what the proof does not
suggest,” which is for closing argument.
Impact
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Trial practice—Rule 29 renewal: The opinion reinforces an unforgiving preservation trap. Defense counsel who present evidence
must renew Rule 29 at the close of all evidence (and after rebuttal, if applicable) or face the nearly insurmountable “record is devoid”
standard on appeal.
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Digital-forensics litigation: The case illustrates that common mobile-forensic artifacts (thumbnails, extraction reports, cached
traces, metadata) will ordinarily clear Rules 401 and 403. Disputes about what these artifacts “mean” for user intent usually go to weight,
not admissibility—especially when no timely objection is made.
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Rule 702 strategy: Defendants seeking exclusion of digital-forensics testimony must make a targeted methodological challenge
(principles, methods, application), not a generalized complaint about inferential ambiguity. Otherwise, courts may deem the argument outside
Rule 702’s scope.
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Jury instructions: The opinion reaffirms that a defendant can obtain an instruction capturing the legal theory (e.g., failure to
prove knowledge) but not a mini-summation of favorable facts. This shapes how defense counsel should draft proposed instructions: emphasize
doctrine, not evidentiary commentary.
Complex Concepts Simplified
- Rule 29 motion (judgment of acquittal)
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A request that the judge enter a not-guilty judgment because the evidence is legally insufficient. If the defendant presents evidence after the
government rests, Sixth Circuit law requires renewing the motion at the end of all evidence to preserve full appellate review.
- “Manifest miscarriage of justice” review
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A highly deferential standard applied when sufficiency was not properly preserved. The defendant must show the record is essentially empty of
evidence supporting guilt—not merely that the evidence was weak or disputed.
- Cellebrite extraction
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A common forensic process/toolset used to copy and report data from a mobile device, often generating reports on file names, timestamps, and
stored media.
- Thumbnail
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A small preview image associated with a video or photo. Its creation time can sometimes suggest when a file was viewed, but device behaviors
vary, and thumbnails may be deleted or replaced.
- “Garbage collection process”
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A routine device/storage process that frees space by removing items the system no longer needs. In the opinion, it was used to explain why an
older thumbnail might no longer exist.
- Unallocated space / caching (contrasting cases)
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Places where files can exist without obvious user action or easy user access. The court distinguished prior cases where images were found in
such areas (Keefer, Dobbs) from Nelson’s situation, where the file was stored in an application on the phone.
- Rule 702
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The rule governing expert testimony reliability. It is triggered by challenges to an expert’s methods or principles—not simply by arguments
that the jury could draw an overconfident inference from technical facts.
Conclusion
United States v. Scott Nelson affirms a child-pornography possession conviction while delivering practical, procedure-forward
lessons. First, a defendant who does not renew a Rule 29 motion after presenting evidence effectively forfeits ordinary sufficiency review and
faces the “manifest miscarriage of justice” standard. Second, digital forensic artifacts and extraction reports will typically be admitted under
Rules 401 and 403—particularly absent timely objections—and disputes about what those artifacts imply about “knowing” conduct are usually for the
jury. Third, Rule 702 is not a generalized tool to attack inferential reasoning unmoored from a concrete methodological challenge. Finally, a
theory-of-defense instruction must state law, not argue facts.
Even as an unpublished decision, the opinion’s synthesis of preservation doctrine, digital-evidence admissibility, and instruction practice
provides a clear roadmap for how the Sixth Circuit will evaluate similar claims—especially when defendants attempt to recast evidentiary weight
disputes as admissibility errors on appeal.