§ N.H. Rev. Stat. § 666:12Testimonial Privilege.

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No witness in any proceeding for the violation of election laws shall be excused from giving his testimony upon the ground that such testimony would incriminate him; but no such testimony shall be used against him at any time or in any prosecution. Any person who voluntarily discloses the facts to the proper authorities and procures a conviction in any such proceeding shall not be prosecuted for his connection with the bribery or attempted bribery.

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