W. Va. Code R. § 171-2-10
Subpoenas requiring the attendance of witnesses from any place in the State of West Virginia at any designated place of hearing before the Commission for the purpose of taking the testimony of such witnesses will be issued upon the application of any party by the Director or any member of the Commission. Subpoenas for the production of books, papers or documents will also be issued by the Director or any member of the Commission upon application in writing or by the Commission upon its own motion. Such application shall be verified by affidavit, shall describe the books, papers or documents desired to be produced with sufficient particularity for identification and shall state that the applicant believes the same are necessary to the determination of the merits of the case.
W. Va. Code R. § 171-2-10