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  • United States v. Rosario-DiazUnited States v. Rosario-Diaz
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United States v. Rosario-Diaz

United States Court of Appeals for the First Circuit
202 F.3d 54 (1st Cir. 2000)


Ralph Rosario-Diaz and other individuals (defendants) were charged with a carjacking that resulted in the death of a victim. Gregorio Aponte-Lazu, a co-conspirator in the carjacking, pled guilty and agreed to testify on behalf of the prosecution. After Aponte-Lazu testified, the prosecution called FBI agent Daryl Huff as a witness. Huff testified, over the defendants’ objection, about his interactions with Aponte-Lazu during the investigation. Specifically, Huff testified about how the investigators had determined whether Aponte-Lazu was telling the truth, and about certain occasions on which the investigators knew that Aponte-Lazu was lying. Aponte-Lazu’s credibility had not been attacked. The district court instructed the jury to determine Aponte-Lazu’s credibility based only on Aponte-Lazu’s testimony, and not on Huff’s testimony. The defendants were convicted, and they appealed.

Rule of Law


Holding and Reasoning (Torruella, C.J.)

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