In Webb v. Texas (1972) 409 U.S. 95, the trial judge "gratuitously singled out the only defense witness for a lengthy admonition on the dangers of perjury," "implied that he expected the witness to lie, and went on to assure him that if he lied, he would be prosecuted and probably convicted for perjury, that the sentence for that conviction would be added on to his present sentence, and that the result would be to impair his chances for parole." (Id. at p. 98.) The High Court held that "in light of the great disparity between the posture of the presiding judge and that of a witness in these circumstances, the unnecessarily strong terms used by the judge could well have exerted such duress on the witness' mind as to preclude him from making a free and voluntary choice whether or not to testify." (Id. at p. 98.)