Use Immunity refers to the legal protection given to a witness in exchange for their testimony in a case. If granted, the witness cannot be criminally prosecuted on the basis of the evidence they reveal. Synonyms for use immunity include transactional immunity or blanket immunity, both of which provide comprehensive protection from prosecution for any criminal activities that the witness may have engaged in. Another related term is limited immunity, which protects the witness only from self-incriminating information revealed in their testimony. Use immunity is a valuable tool for prosecutors seeking to unravel cases, and can provide important information in complex investigations.