(b) The Presiding Officer may issue an order under this section if—
(1) The testimony or other information from the witness may be necessary to the public interest; and
(2) The witness has refused or is likely to refuse to testify or provide other information on the basis of a privilege against self-incrimination.
(c) Immunity provided by this section will not become effective until the person has refused to testify or provide other information on the basis of a privilege against self-incrimination, and an order under this section has been issued. An order, however, may be issued prospectively to become effective in the event of a claim of the privilege.
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