California, United States of America
The following excerpt is from People v. Nieber, D073059 (Cal. App. 2019):
5. Use immunity protects a witness only against the actual use of his compelled testimony, and evidence derived therefrom, while transactional immunity protects the witness more broadly against prosecution related to matters about which the witness testified. (People v. Kennedy (2005) 36 Cal.4th 595, 613.)
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