O.C.G.A. § 24-13-95 (2019)

(a) If a person confined in a penal institution in any other state is a material witness in a criminal proceeding pending in a court of record or in a grand jury investigation in this state, a judge of the court may certify that there is a criminal proceeding or investigation by a grand jury or a criminal proceeding pending in the court, that a person who is confined in a penal institution in the other state is a material witness in the proceeding or investigation, and that the witness’s presence will be required during a specified time. The certificate shall be presented to a judge of a court of record in the other state having jurisdiction over the confined prisoner, and a notice shall be given to the attorney general of the state in which the prisoner is confined.

(b) The judge of the court in this state may enter an order directing compliance with the terms and conditions prescribed by the judge of the state in which the witness is confined.