California Code, Penal Code - PEN § 138

(a) Every person who gives or offers or promises to give to any witness or person about to be called as a witness, any bribe upon any understanding or agreement that the person shall not attend upon any trial or other judicial proceeding, or every person who attempts by means of any offer of a bribe to dissuade any person from attending upon any trial or other judicial proceeding, is guilty of a felony.

(b) Every person who is a witness, or is about to be called as such, who receives, or offers to receive, any bribe, upon any understanding that his or her testimony shall be influenced thereby, or that he or she will absent himself or herself from the trial or proceeding upon which his or her testimony is required, is guilty of a felony.