28 U.S.C. App. (FEDERAL RULES OF EVIDENCE) Rule 410

(a) Prohibited Uses. In a civil or criminal case, evidence of the following is not admissible against the defendant who made the plea or participated in the plea discussions: (1) a guilty plea that was later withdrawn; (2) a nolo contendere plea; (3) a statement made during a proceeding on either of those pleas under Federal Rule of Criminal Procedure 11 or a comparable state procedure; or (4) a statement made during plea discussions with an attorney for the prosecuting authority if the discussions did not result in a guilty plea or they resulted in a later-withdrawn guilty plea. (b) Exceptions. The court may admit a statement described in Rule 410(a)(3) or (4): (1) in any proceeding in which another statement made during the same plea or plea discussions has been introduced, if in fairness the statements ought to be considered together; or (2) in a criminal proceeding for perjury or false statement, if the defendant made the statement under oath, on the record, and with counsel present.