(a) No employee or former employee of the General Assembly may be compelled to give testimony or to appear and produce documentary evidence in a judicial or quasi-judicial proceeding if:
(1) the testimony or documentary evidence sought relates to a legislative duty or act performed by the employee; and
(2) neither a member of the General Assembly nor the employee is a party in the proceeding.
(b) Any order or subpoena purporting to compel testimony or the production of evidence that is prohibited under subsection (a) of this section shall be unenforceable.
(c) Official documents, as defined in subdivision 403(b)(2) of this title, shall be admissible under V.R.C.P. 44.