United States v. Moore

United States Court of Appeals for the District of Columbia Circuit · 2011 · Evidence

651 F.3d 30 (D.C. Cir. 2011)

Updated August 22, 2026

EvidenceConfrontation ClauseBullcomingMelendez-Diazautopsy reportsDEA lab reportsoverview witnessFBI agent

Facts

At trial, the government called FBI Agent Daniel Sparks as its first witness to give an overview of the case before the government had introduced the supporting evidence. The government also introduced autopsy reports prepared by non-testifying medical examiners through Dr. Jonathan Arden and DEA drug-analysis reports prepared by non-testifying chemists through Jerry Walker, with the reports themselves admitted into evidence. In addition, the government introduced some evidence of uncharged conduct involving Moore, Nunn, Gray, and others. The defendants argued that the overview testimony, the forensic reports, and the uncharged-acts evidence were improperly admitted.

Issue

Whether the district court erred by allowing an overview witness to summarize and opine on the government's anticipated proof, by admitting autopsy and DEA forensic reports through surrogate witnesses rather than the reports' authors, and by admitting certain uncharged-acts evidence. If error occurred, the question was whether the error required reversal.

Rule

A law enforcement overview witness may provide background based on personal knowledge, but may not preview unadmitted evidence, vouch for witness credibility, opine on the strength of the government's case, or otherwise present tendentious lay testimony. Under the Confrontation Clause, testimonial forensic reports may not be introduced through a surrogate witness who neither performed nor observed the testing and cannot convey what the certifying analyst knew or did; harmless-error review applies to non-structural confrontation error. Under Rule 404(b), evidence of uncharged acts is outside the rule only if it is intrinsic to the charged offense, meaning it is part of the charged offense or contemporaneous acts facilitating its commission.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

In a federal drug-and-robbery trial in Chicago, the prosecution calls Special Agent Lena Ortiz as its first witness. Ortiz personally supervised surveillance teams and explains when the investigation began, which neighborhoods were watched, and what devices officers used, but she also tells the jury that cooperating insiders are usually the only people who can reveal "what really happened" and that the government's cooperating witnesses in this case were thoroughly vetted for truthfulness.

Which is the best assessment of Ortiz's testimony?

Explanation. A law-enforcement witness may testify first and may provide background based on personal knowledge, such as the investigation's duration, scope, and techniques. But the witness may not preview tendentious conclusions, vouch for witness credibility, or imply that cooperators are truthful because the government vetted them. So the background portion is permissible, while the credibility-vouching portion is improper.