To be admissible, the absence of other similar events or accidents must be relevant and not unduly prejudicial

Fed. R. Evid. 408(b) ("This rule does not require exclusion if the evidence is offered for purposes not prohibited by subdivision (a). Examples of permissible purposes include ... proving an effort to obstruct a criminal investigation or prosecution.").Although settlement negotiations and offers are inadmissible (i) to show the validity or invalidity of a claim when validity is in dispute, (ii) to show the amount of damages when the amount is in dispute, or (iii) to impeach by showing a prior inconsistent statement or specific contradiction, settlement evidence is admissible to show an attempt to obstruct a criminal investigation or prosecution.

Cf. United States v. $125,938.62 Proceeds of Certificates of Deposit, 537 F.3d 1287, 1292 (11th Cir. 2008) (holding, in government's civil forfeiture action involving funds stolen from the Nicaraguan treasury, that evidence of Nicaraguan President's judgment of....An exception to the hearsay rule applies to the following records of government offices and agencies: (A) public records that set forth the activities of the government office or agency; (B) public records that set forth observations that a government office or agency was required to make and report but this exception does not apply in criminal cases to observations of police officers and other law enforcement personnel; or (C) in civil actions and proceedings and in criminal cases when offered against the government, factual findings resulting from an investigation made pursuant to authority granted by law, unless the sources of information or other circumstances indicate the untrustworthiness of such findings.

Wiener v. Farm Credit Bank of St. Louis, 759 F. Supp. 510, 521 (E.D. Ark. 1991) (holding, in plaintiff optionees' action against defendant bank for specific performance of real estate contracts, that evidence of telephone conversation....Although settlement negotiations and offers are inadmissible (i) to show the validity or invalidity of a claim when validity is in dispute, (ii) to show the amount of damages when the amount is in dispute, or (iii) to impeach by showing a prior inconsistent statement or specific contradiction, settlement evidence is admissible to show that a party had knowledge or notice of a fact.