Vt. Stat. tit. 18 § 504
When the State's Attorney of a county, on the order of a Superior judge or the Attorney General, for use in a criminal cause pending in the State's Attorney's office, requests an expert investigation, chemical or pathological, of a substance, such investigation shall immediately be made at the laboratory, without charge to the State, and the expert making or interpreting such investigation shall submit the results of such expert's work to such State's Attorney and shall attend court as a witness at any place in the State when required to do so by subpoena and submit in court the results of such expert's investigation, and the expert shall be paid as a witness, including the expert's actual expenses of attendance when summoned by the State.
18 V.S.A. § 504