W. Va. Code § 7-6-5a
Notwithstanding any other provision of this code, when it appears to any of the various fiscal bodies of the county that funds on deposit in its demand deposit account exceed the current requirements or demands, and it further be determined by the county treasurer that the available interest rate offered by an acceptable depository in such treasurer's county be less than the interest rate, net of any administrative fees, offered it through state investments, the county treasurer may, with the approval in writing of each fiscal body whose funds are involved, make such funds available for investment by the West Virginia Investment Management Board in accordance with the provisions of § 12-6-1et seq. of this code or the West Virginia Board of Treasury Investments in accordance with the provisions of § 12-6C-1et seq. of this code.
Any income earned on such investment shall be allocated by such treasurer to the fiscal body whose funds were made available, such allocation to be made in accordance with the accounting and allocation principles established by the West Virginia Investment Management
Board or the West Virginia Board of Treasury Investments, as applicable.
W. Va. Code § 7-6-5a