Evidence of:
Evidence of conduct or statements made in compromise negotiations is not admissible. This section does not require the exclusion of discoverable evidence merely because it is revealed in the course of compromise negotiations. This section does not require exclusion of evidence when it is offered for another purpose, including proof of bias or prejudice of a witness, negativing a contention of undue delay, or proof of an effort to obstruct a criminal investigation or prosecution.
Okla. Stat. tit. 12, § 2408