California Code, Government Code - GOV § 53911

The governing body may authorize the use of check-warrant forms, to be drawn by its appropriate warrant issuing officer or officers upon the custodian of its funds, so prepared that the custodian may, by subscribing a direction to the depository of the funds to pay the funds to the order of the payee, convert the instrument to a check or, by subscribing an endorsement that the warrant is not paid for want of funds, convert the instrument to an interest bearing warrant and the governing body may direct that check-warrants shall not be delivered to the payees named therein until the direction or indorsement has been subscribed by the custodian of its funds.