Federal Rule of Evidence 410 or a comparable State rule bars the use of plea offers, plea negotiations, withdrawn pleas, and pleas of nolo contendere (no contest pleas) against the defendant who engaged in such plea negotiations, entered such a withdrawn plea, or entered such a plea of nolo contendere.

Stecyk v. Bell Helicopter Textron, Inc., 295 F.3d 408, 415-416 (3d Cir. 2002) (holding, in plaintiff estate representatives' wrongful death action against defendant manufacturer, that evidence of post incident use of the two-way seal was....Although Federal Rule of Evidence 407 and similar State rules bar the use of subsequent remedial measures to prove negligence or culpable conduct, a defect in the product or its design, or a need for warning or instruction, subsequent remedial measures evidence can be used to impeach the credibility of a witness.

United States v. Jennings, 496 F.3d 344, 349-350 (4th Cir. 2007) (upholding trial court's admission of testimony of two passengers [about the statements of the 13-year old girl on what had occurred on the flight] as excited....A statement falls within the hearsay exception created by Federal Rule of Evidence 803(2) or a comparable State rule for excited utterances, only if the declarant (the maker of the statement) was under the stress of the startling event or condition when he or she made the statement that relates to that startling event or condition.

Stainton v. Tarantino, 637 F. Supp. 1051, 1080-1082 (E.D. Pa. 1986) (holding, in plaintiffs' action against defendant real estate broker for dissolution of partnerships, that evidence of [appraiser's testimony about the]....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, such settlement offers and negotiations are admissible if they are used to impeach a witness by showing the bias or interest of the witness.