Okla. Stat. tit. 19, § 121
The county treasurer of each county shall deposit daily (not later than the immediately next banking day) all the funds and monies of whatever kind that shall come into his possession by virtue of his office as such county treasurer in his name as county treasurer in one (1) or more banks located in the county and designated by the board of county commissioners as county depositories. Provided, before the deposit of any such funds aforesaid, the county treasurer shall take from each of said banks security in a sum equal to the largest approximate amount that may be deposited in each bank respectively at any one time; said security is mandatorily required to be pledged, taken, approved, held and withdrawn under the provisions of the Unit Collateral System prescribed in Sections 516.1 et seq. of Title 62 of the Oklahoma Statutes.
Each bank in which said county funds are deposited shall receive all monies, checks, or drafts at par and for deposit only to the credit of said county treasurer in his official capacity, and that each bank shall promptly honor the checks, drafts, or vouchers of the treasurer of said county on such deposit.
Added by Laws 1959, HB 728, p. 94, § 1, emerg. eff. July 15, 1959; Amended by Laws 1997, HB 1817, c. 164, § 1, emerg. eff. July 1, 1997 (superseded document available).