In Prudhomme v. Superior Court (1970) 2 Cal.3d 320, the court said, "an ordinary witness need not actually prove the existence of an incriminatory hazard as that would surrender the very protection which the privilege against self-incrimination was designed to guarantee. Instead, the privilege forbids compelled disclosures which could serve as a 'link in a chain' of evidence tending to establish guilt of a criminal offense; in ruling upon a claim of privilege, the trial court must find that it clearly appears from a consideration of all the circumstances in the case that an answer to the challenged question cannot possibly have a tendency to incriminate the witness. " ( Id. at p. 326.)