Okla. Stat. tit. 62 § 275.1
All warrants or checks issued by the Commission for Human Services and the State Treasurer, in payment of assistance to the needy, aged persons, blind or dependent children, shall be microfilmed or duplicated in a manner acceptable to the Archives and Records Commission, provided further that the Department of Human Services is hereby authorized and directed to destroy said warrants, by burning, shredding, chemical process or any other method which will insure the complete destruction thereof, after microfilm or other copies are made thereof. Any redeemed warrant or check that has been microfilmed, imaged or duplicated in a manner acceptable to the Archives and Records Commission shall be destroyed after a period of time consistent with banking industry standards for checks. The Archives and Records Commission, with the assistance of the State Treasurer, shall survey financial institutions to determine the industry standard for retention of paper checks after they have been duplicated in a manner consistent with federal law and industry practice. Such survey shall include the industry standard or federal law for retention of duplicated checks.
Okla. Stat. tit. 62, § 275.1