Vt. Stat. Ann. tit. 12, § 1642

When, in the opinion of the court, a witness produced by a party is adverse, such party, by leave of court, may prove that such witness has made statements inconsistent with his or her testimony. Before such proof is given, the attention of the witness shall be called to the occasion of such supposed statements and he or she be asked whether or not he or she has made the same.