Okla. Stat. tit. 15, § 15-566: Prima facie evidence of illegality of contract and

operation of bucketshop.

Every person shall furnish upon demand to any principal for whom

such person has executed any contract of sale for the future

delivery of any cotton, grain, stocks or other commodities a written

instrument setting forth the name and location of the exchange,

board of trade or similar institution upon which such contract has

been executed, the date of execution of the contract and the name

and address of the persons with whom such contract was executed and

if such person shall refuse or neglect to furnish such statement

upon reasonable demand, such refusal or neglect shall be prima facie

evidence that such contract was an illegal contract within the

provisions of Section 4, of this act, and that the person who

executed it was engaged in the maintenance and operation of a

"bucket shop" within the provisions of Section 7, of this act.