(1)  On and from the commencement of this Act a subpoena ad testificandum and a subpoena duces tecum may not be issued or used in criminal proceedings.

(2)  Nothing in subsection (1) affects a subpoena ad testificandum or a subpoena duces tecum that was issued and in force immediately before the commencement of this Act and a prosecutor or an accused person is competent to bring proceedings arising from any such subpoena notwithstanding this Act.