SDCL § 7-20-9: Forms of deposit--Crediting of interest from deposits--Signatures required on checks.

All moneys shall be deposited in such banks in demand accounts, savings accounts, or on time deposit, and any interest accrued from such deposits shall be credited to the respective funds or the general fund. All such demand deposits are subject to payment if demanded by the county treasurer on the county treasurer's check, countersigned by the county auditor.