Immunity is a legal promise from the government that you will not be prosecuted for what you say. It is most often granted to witnesses who otherwise would refuse to testify by invoking the Fifth Amendment. In exchange for the protection, the witness has to answer truthfully — and if they lie, the immunity does not protect them from a perjury prosecution.
How Immunity Works in California
California immunity is governed primarily by Penal Code § 1324, which allows the prosecution to apply for an order compelling testimony in exchange for “use and derivative use” immunity. This means the witness’s testimony, and any evidence derived from it, cannot be used against them in a later prosecution — but the government remains free to prosecute them based on independently obtained evidence. This is narrower than “transactional immunity,” which would bar prosecution for the underlying transaction entirely.
Federal immunity operates similarly under 18 U.S.C. § 6002. Both systems require careful negotiation. Informal “letter immunity” or “proffer agreements” are also common, particularly in white collar and federal cases — these are direct contracts between the witness and the prosecutor that may provide more or less protection than statutory immunity, depending on the language. Each type creates different risks and opportunities.
Why Immunity Matters to Your Defense
The decision to accept immunity is one of the most consequential choices a witness — or a target of investigation — can make. Done well, it can resolve criminal exposure, end a grand jury subpoena, or lock in cooperation that benefits the witness in their own case. Done poorly, it can lock in damaging admissions while leaving the witness exposed to prosecution from other angles.
For defendants in active California criminal cases, immunity can also flow the other way. Sometimes a key defense witness will not testify without immunity, and Penal Code § 1324 allows the defense to seek a court-ordered grant in limited circumstances. A skilled criminal defense attorney evaluates whether immunity is the right tool, drafts proffer letters carefully, and protects the client’s interests at every step.
Related Legal Terms
Immunity intersects with the Fifth Amendment privilege against self-incrimination, the operation of grand jury subpoenas, and the negotiation dynamics of a plea bargain. It is a frequent feature of our federal defense and white collar crime practice.
Facing Charges Where This Applies?
If you have been offered immunity, subpoenaed to testify, or are weighing cooperation, the agreements you sign now will define your exposure for years. Attorney Chris Nalchadjian offers free, confidential consultations 24/7. Call KN Law Firm at (888) 950-0011.
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