Penal Code § 133
CHAPTER 6. Falsifying Evidence, and Bribing, Influencing, Intimidating or Threatening Witnesses
Every person who practices any fraud or deceit, or knowingly makes or exhibits any false statement, representation, token, or writing, to any witness or person about to be called as a witness upon any trial, proceeding, inquiry, or investigation whatever, authorized by law, with intent to affect the testimony of such witness, is guilty of a misdemeanor.