1. A waiver of immunity is a written instrument subscribed by a person who is or is about to become a witness in a grand jury proceeding, stipulating that he waives his privilege against self-incrimination and any possible or prospective immunity to which he would otherwise become entitled, pursuant to section 190.40 , as a result of giving evidence in such proceeding.
2. A waiver of immunity is not effective unless and until it is sworn to before the grand jury conducting the proceeding in which the subscriber has been called as a witness.
3. A person who is called by the people as a witness in a grand jury proceeding and requested by the district attorney to subscribe and swear to a waiver of immunity before giving evidence has a right to confer with counsel before deciding whether he will comply with such request, and, if he desires to avail himself of such right, he must be accorded a reasonable time in which to obtain and confer with counsel for such purpose. The district attorney must inform the witness of all such rights before obtaining his execution of such a waiver of immunity. Any waiver obtained, subscribed or sworn to in violation of the provisions of this subdivision is invalid and ineffective.
4. If a grand jury witness subscribes and swears to a waiver of immunity upon a written agreement with the district attorney that the interrogation will be limited to certain specified subjects, matters or areas of conduct, and if after the commencement of his testimony he is interrogated and testifies concerning another subject, matter or area of conduct not included in such written agreement, he receives immunity with respect to any further testimony which he may give concerning such other subject, matter or area of conduct and the waiver of immunity is to that extent ineffective.
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