(1) In order to convict a person of any crime defined in this chapter it shall not be necessary that the testimony of the alleged victim be corroborated.
(2) Evidence of the victim's past sexual behavior including but not limited to the victim's marital history, divorce history, or general reputation for promiscuity, nonchastity, or sexual mores contrary to community standards is inadmissible on the issue of credibility and is inadmissible to prove the victim's consent except as provided in subsection (3) of this section, but when the perpetrator and the victim have engaged in sexual intercourse with each other in the past, and when the past behavior is material to the issue of consent, evidence concerning the past behavior between the perpetrator and the victim may be admissible on the issue of consent to the offense.
(3) In any prosecution for the crime of rape, trafficking pursuant to RCW 9A.40.100 , or any of the offenses in chapter 9.68A RCW, or for an attempt to commit, or an assault with an intent to commit any such crime evidence of the victim's past sexual behavior including but not limited to the victim's marital behavior, divorce history, or general reputation for promiscuity, nonchastity, or sexual mores contrary to community standards is not admissible if offered to attack the credibility of the victim and is admissible on the issue of consent, except where prohibited in the underlying criminal offense, only pursuant to the following procedure:
(a) A written pretrial motion shall be made by the defendant to the court and prosecutor stating that the defense has an offer of proof of the relevancy of evidence of the past sexual behavior of the victim proposed to be presented and its relevancy on the issue of the consent of the victim.
(b) The written motion shall be accompanied by an affidavit or affidavits in which the offer of proof shall be stated.
(c) If the court finds that the offer of proof is sufficient, the court shall order a hearing out of the presence of the jury, if any, and the hearing shall be closed except to the necessary witnesses, the defendant, counsel, and those who have a direct interest in the case or in the work of the court.
(d) At the conclusion of the hearing, if the court finds that the evidence proposed to be offered by the defendant regarding the past sexual behavior of the victim is relevant to the issue of the victim's consent; is not inadmissible because its probative value is substantially outweighed by the probability that its admission will create a substantial danger of undue prejudice; and that its exclusion would result in denial of substantial justice to the defendant; the court shall make an order stating what evidence may be introduced by the defendant, which order may include the nature of the questions to be permitted. The defendant may then offer evidence pursuant to the order of the court.
(4) Nothing in this section shall be construed to prohibit cross-examination of the victim on the issue of past sexual behavior when the prosecution presents evidence in its case in chief tending to prove the nature of the victim's past sexual behavior, but the court may require a hearing pursuant to subsection (3) of this section concerning such evidence.
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