I. If a court of another state has made a custody decree, a court of this state shall not modify that decree unless (a) it appears to the court of this state that the court which rendered the decree does not now have jurisdiction under jurisdictional prerequisites substantially in accordance with this chapter or has declined to assume jurisdiction to modify the decree and (b) the court of this state has jurisdiction.
   II. If a court of this state is authorized under paragraph I and RSA 458-A:8 to modify a custody decree of another state, it shall give due consideration to the transcript of the record and other documents of all previous proceedings submitted to it in accordance with RSA 458-A:21.
Source. 1979, 345:1, eff. Sept. 1, 1979.