RCW 9A.72.090: Bribing a witness.

(1) A person is guilty of bribing a witness if he or she offers, confers, or agrees to confer any benefit upon a witness or a person he or she has reason to believe is about to be called as a witness in any official proceeding or upon a person whom he or she has reason to believe may have information relevant to a criminal investigation or the abuse or neglect of a minor child, with intent to:

(a) Influence the testimony of that person; or

(b) Induce that person to avoid legal process summoning him or her to testify; or

(c) Induce that person to absent himself or herself from an official proceeding to which he or she has been legally summoned; or

(d) Induce that person to refrain from reporting information relevant to a criminal investigation or the abuse or neglect of a minor child.

(2) Bribing a witness is a class B felony.