(a) Effective July 9, 1975, any county may modify the warrant system as a means of payment of claims properly presented and allowed against counties of this state to better comply with current business and banking practices.
(b) All claims properly presented and allowed by the respective county courts and school districts of this state, as provided by law, may be ordered paid by check drawn against county funds maintained by the county treasurer in his or her official capacity as custodian of the funds.