The certification of a narcotic addict to the care and custody of the department pursuant to § 21-28.2-3 — § 21-28.2-11, or the transfer of the narcotic addict pursuant to § 21-28.2-12, shall not forfeit or abridge any of the rights of the narcotic addict as a citizen of the United States or of the state of Rhode Island, nor shall the provisions of the election law depriving or limiting the right of a person admitted or certified to a mental institution to register or vote be applicable to the narcotic addict; nor shall the facts or proceedings relating to the admission, certification, or treatment of the narcotic addict be used against that person in any proceeding in any court, other than a proceeding pursuant to the provisions of this chapter.