United States v. Allen, No. 16-898 (2d Cir. 2017)Annotate this Case
The Fifth Amendment's prohibition on the use of compelled testimony in American criminal proceedings applies even when a foreign sovereign has compelled the testimony. When the government makes use of a witness who had substantial exposure to a defendant's compelled testimony, it is required under Kastigar v. United States, 406 U.S. 441 (1972), to prove, at a minimum, that the witness's review of the compelled testimony did not shape, alter, or affect the evidence used by the government. A bare, generalized denial of taint from a witness who has materially altered his or her testimony after being substantially exposed to a defendant’s compelled testimony is insufficient as a matter of law to sustain the prosecution’s burden of proof. In this case involving the London Interbank Offered Rate (LIBOR), defendants were convicted of wire fraud and conspiracy to commit wire fraud and bank fraud. The Second Circuit held that defendants' compelled testimony was "used" against them, and this impermissible use before the petit and grand juries was not harmless beyond a reasonable doubt. Accordingly, the court reversed the judgments of conviction and dismissed the indictment.