Okla. Stat. tit. 12, § 12-2608

A. The credibility of a witness may be attacked or supported by

evidence in the form of opinion or reputation, subject to these

limitations:

1. The evidence may refer only to character for truthfulness or

untruthfulness; and

2. Evidence of truthful character is admissible only after the

character of the witness for truthfulness has been attacked.

B. Specific instances of the conduct of a witness, for the

purpose of attacking or supporting the witness’s credibility, other

than conviction of crime as provided in Section 2609 of this title,

may not be proved by extrinsic evidence. They may, however, in the

discretion of the court, if probative of truthfulness or

untruthfulness, be inquired into on cross-examination of the witness

if they:

1. Concern the witness’s character for truthfulness or

untruthfulness;

2. Concern the character for truthfulness or untruthfulness of

another witness as to which character the witness being cross-

examined has testified.

C. The giving of testimony, whether by an accused or by any

other witness, does not operate as a waiver of the accused’s or the

witness’s privilege against self-incrimination when examined with

respect to matters which relate only to credibility.