Ganier v. United States

United States Court of Appeals for the Sixth Circuit · 2006 · Evidence

EvidenceExpert testimonyCriminal procedureRule 16 discoveryFederal Rule of Criminal Procedure 16(a)(1)(G)Federal Rule of Criminal Procedure 16(d)(2)Federal Rule of Evidence 702Federal Rule of Evidence 701

Facts

Ganier was charged with obstruction-related offenses based in part on allegations that he deleted computer files to impede a federal investigation. After Ganier disclosed that he intended to present expert evidence about the computers' search functions and the existence of duplicate documents, the government's forensic computer specialist used forensic software to determine what searches had been run on three computers. On the day before trial, the specialist generated reports that the government said showed searches in December 2002 using terms relevant to the grand jury investigation and allegedly deleted files. The government did not provide Ganier with a written summary of the specialist's proposed testimony before trial, and Ganier moved to exclude the reports and related testimony.

Issue

Whether the government's forensic computer specialist would be offering expert testimony within the meaning of Federal Rule of Evidence 702, thus requiring a written summary under Federal Rule of Criminal Procedure 16(a)(1)(G), and, if so, whether the district court properly excluded the evidence as a sanction for nondisclosure. Also, whether the government adequately preserved its challenge to the exclusion order without a formal offer of proof.

Rule

Testimony interpreting computer-forensic software reports requires scientific, technical, or other specialized knowledge and therefore falls within Federal Rule of Evidence 702 rather than lay testimony under Rule 701. When Rule 16 is violated, a court considering exclusion must evaluate the reasons for the delay, the prejudice to the opposing party, and whether that prejudice can be cured by a less severe remedy; suppression should be limited to the least severe sanction necessary to achieve remedial objectives.

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

In a fraud prosecution in Columbus, Ohio, the government calls Nia Torres, a digital analyst, to testify that a forensic program's registry report shows the defendant searched for the phrase "invoice wipe" on three dates. Nia did not observe the searches when they occurred; she examined the computer weeks later using specialized forensic software and translated the report's strings and timestamps into her conclusion.

If the defendant objects that no written expert summary was provided before trial, how should the court classify Nia's proposed testimony?

Explanation. The majority treated testimony interpreting forensic software reports as expert testimony, not lay testimony. Even if the software generates the output, explaining what the report means—such as what searches were run and when—requires technical familiarity beyond an average layperson's knowledge, so Rule 702 applies and Rule 16's expert-summary requirement is triggered. (Derived from Ganier v. United States (n.d.).)