It may be issued by any court, except district or municipal courts, to an inferior tribunal, or to a corporation, board or person, in all cases where there is not a plain, speedy and adequate remedy in the ordinary course of law. It is issued upon affidavit, on the application of the person beneficially interested.
RCW 7.16.300
Intent-1987 c 202: See note following RCW 2.04.190.