Federal Rule of Evidence 410 or a comparable State rule bars the use of a nolo contendere plea (no contest plea) as evidence in any proceeding against the defendant who entered this plea.

Fed. R. Evid. 609(a)(1) ("(a) General rule. For the purpose of attacking the character for truthfulness of a witness, (1) evidence that a witness other than an accused has been....If a conviction is offered to impeach a witness and the conviction is not for a crime that involves dishonesty or false statement, the conviction of the witness may be used to impeach the witness if the crime for which the witness was convicted is punishable by death or imprisonment for more than a year, if the crime the witness committed is probative of the truthfulness of the witness, and if the opponent fails to show that the risk of prejudice or other harm mentioned in Federal Rule of Evidence 403 outweighs the probative value of the conviction; but if the witness to be impeached is a criminal defendant, the prosecution bears the burden of showing that the probative value of the conviction outweighs the risk of prejudice to the defendant.

Fed. R. Evid. 413(b) ("In a case in which the Government intends to offer evidence under this rule, the attorney for the Government shall disclose the evidence to the defendant, including statements of witnesses or a summary of the substance of any testimony that is expected to be offered, at least fifteen days before the scheduled date of...In a case in which the prosecutor intends to offer evidence of similar sexual assaults under Federal Rule of Evidence 413, the prosecutor must disclose the evidence of such assaults to the defendant, including statements of witnesses or a summary of the substance of any testimony that is expected to be offered, at least fifteen days before the scheduled date of trial unless the trial court for good cause allows disclosure at a later time.

Fed. R. Evid. 801(c) ("'Hearsay' is a statement, other than one made by the declarant while testifying at the trial or hearing, offered in evidence to prove the truth of the matter asserted.").Hearsay is a statement that (i) is made other than at the trial or proceeding at which it is offered and (ii) is offered to prove the truth of the matter asserted by the maker of the statement, the declarant.