prohibited -- Exceptions No individual is excused from attending and testifying or from producing any documents or records, or an obedience to the subpoena of the attorney general, or in any proceeding instituted by the attorney general, on the ground that the testimony or evidence, documentary or otherwise, required of him may tend to incriminate him. However, no testimony or other information compelled or any information directly or indirectly derived from the compelled testimony or information may be used against the individual in any criminal proceeding except for a prosecution for perjury, giving a false statement, or contempt.