(a) A person called as a witness before the senate, house of representatives, or a committee of either or both, who refuses to answer any question or to produce any book, paper, or document relating to the matter under inquiry, on the ground that the answer or the production may tend to incriminate the person, may be granted immunity from punishment for the offense to which the question or evidence relates by resolution of the house that is conducting the inquiry. The resolution shall be entered upon its journal, and the witness may then be compelled to answer the question or produce the evidence.
(b) If a witness is granted immunity and compelled to testify or produce evidence after claiming the privilege of self-incrimination, the witness may not thereafter be prosecuted in any court for the offense to which the question or evidence relates.