Section 50a-203 - Evidence(a) The court may consider any evidence admissible in the adjudicating forum or other court of competent jurisdiction, including but not limited to:(1) Affidavits or declarations;(2) Treaties to which the state of either forum is a party;(3) Principles of customary international law;(4) Testimony of fact or expert witnesses;(5) Diplomatic notes or amicus submissions from the state of the adjudicating forum or other court of competent jurisdiction; and(6) Statements of public policy by the state of the adjudicating forum or other court of competent jurisdiction set forth in legislation, executive or administrative action, learned treatises, or participation in intergovernmental organizations.(b) Reasonable written notice shall be given by any party seeking to raise an issue concerning the law of a forum of competent jurisdiction other than the adjudicating forum. In deciding questions of the law of another forum, the court may consider any relevant material or source, including testimony, whether or not admissible.Conn. Gen. Stat. § 50a-203