Okla. Stat. tit. 19, § 19-121: Daily deposit by county treasurer - Security

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 or her possession

by virtue of the office as such county treasurer in the name of the

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, the

county treasurer shall take from each of such banks security in a

sum equal to the largest approximate amount that may be deposited in

each bank respectively at any one time. Such security is required

to be pledged, taken, approved, held and withdrawn under the

provisions of the Security for Local Public Deposits Act prescribed

in Sections 8 through 14 of this act.

Each bank in which such county funds are deposited shall receive

all monies, checks, or drafts at par and for deposit only to the

credit of the county treasurer in his or her official capacity, and

each bank shall promptly honor the checks, drafts, or vouchers of

the treasurer of the county on such deposit.