OT: Ghors: Kastigar hearings probably refer to this Supreme Court decision.
The United States can compel testimony from an unwilling witness who invokes the Fifth Amendment privilege against compulsory self-incrimination by conferring immunity, as provided by 18 U.S.C. § 6002, from use of the compelled testimony and evidence derived therefrom in subsequent criminal proceedings, as such immunity from use and derivative use is coextensive with the scope of the privilege and is sufficient to compel testimony over a claim of the privilege. Transactional immunity would afford broader protection than the Fifth Amendment privilege, and is not constitutionally required. In a subsequent criminal prosecution, the prosecution has the burden of proving affirmatively that evidence proposed to be used is derived from a legitimate source wholly independent of the compelled testimony. Pp. 443-462.
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