SDCL § 13-18-3: Itemized invoice and verified voucher required for issuance of check or warrant--Retention.

No check or warrant may be drawn by the business manager except for indebtedness incurred prior to its issue and upon the presentation of an itemized invoice, accompanied by a voucher verified by the appropriate school official that the services, other than those provided by school district employees, or materials have been received. The invoice and voucher required by this section shall be filed in the office of the business manager.