Rule 408. Compromise and Offers to Compromise

Evidence of (1) furnishing or offering or promising to furnish, or (2) accepting
or offering or promising to accept, a valuable consideration in compromising or
attempting to compromise a claim which was disputed as to either validity or
amount, is not admissible to prove liability for or invalidity of the claim or its
amount. Evidence of conduct or statements made in compromise negotiations is
likewise not admissible. This rule does not require the exclusion of any evidence
otherwise discoverable merely because it is presented in the course of compromise
negotiations. This rule also does not require exclusion when the evidence is
offered for another purpose, such as proving bias or prejudice of a witness,
negativing a contention of undue delay, or proving an effort to obstruct a
criminal investigation or prosecution.