W. Va. Code § 52-2-14

Whenever it appears to the judge of any court of record having criminal jurisdiction that there may be possible offenses against the criminal laws of this state which because of their complexity and involvement may require a grand jury to sit for an extended period of time, he may, pursuant to the provisions of this section, order a grand jury to be drawn and to attend any special, regular or adjourned term of such court in addition to any other grand jury attending any such term of court and all of the provisions of this article shall apply, except as follows:

(1) Such grand jury shall sit for one year unless an order for its discharge be earlier entered upon a determination by such grand jury, by majority vote, that its business has been completed, and such grand jury shall have the power to make presentments or find indictments at any time while it is sitting, notwithstanding the end of the term of court during which it was drawn and summoned;

(2) The term limitation specified in the last sentence of section ten of this article shall not apply to a grand jury attending pursuant to the provisions of this section fourteen; and

(3) Notwithstanding the first two sentences of section thirteen of this article, every person who shall serve upon a grand jury attending pursuant to the provisions of this section fourteen shall be entitled to receive for such services not less than $8 nor more than $20, to be fixed by the court, for each day he may so serve, for a total period not in excess of one year, and in addition thereto the same mileage as allowed to witnesses, to be paid out of the county treasury.