(1) The Supreme Court of a State in which a subpoena is issued may, on application, give leave to serve the subpoena outside the State.
(2) The court may give leave only if it is satisfied that:
(a) the evidence likely to be given by the person to whom the subpoena is addressed, or a document or thing specified in the subpoena, is relevant to the performance by the tribunal of the investigative function concerned; and
(b) if the evidence, document or thing may constitute or contain evidence that relates to matters of state--it is in the public interest that the evidence be given or the document or thing be produced.
(3) In granting an application, the court:
(a) is to impose a condition that the subpoena not be served after a specified day; and
(b) may impose other conditions.