Okla. Stat. tit. 22, § 22-749: Sworn statements taken by district attorney or peace

officer of persons having knowledge of criminal offense - Use.

A. In the investigation of a criminal offense, the district

attorney or any peace officer may take the sworn statement of any

person having knowledge of such criminal offense. Any person

charged with a crime shall be entitled to a copy of any such sworn

statement upon the same being obtained.

B. If a witness in a criminal proceeding gives testimony upon a

material issue of the case contradictory to his previous sworn

statement, evidence may be introduced that such witness has

previously made a statement under oath contradictory to such

testimony.