Constitutional Court Procedure Act Article 20

(Amici Curiae) Any person, authority, or association, other than the parties, who considers herself or himself having an interest in a case pending before the Constitutional Court, may make a motion to the Court, subject to its permission by an order, for the submission of expert opinion or information to be considered within the period of time prescribed by the Constitutional Court.The motion under the preceding Paragraph must set out the interests concerned in writing.Paragraph 3 of the preceding Article shall apply mutatis mutandis when a third-party person or association submit expert opinion or information as permitted by a court order.A third-party person, authority, or association who is permitted by a court order to submit expert opinion or information must appoint an agent. The provisions of Article 8 shall govern the qualifications and number of such agents.As is required by the case to summon those permitted third-party persons, authorities, or associations to appear in court, the Constitutional Court shall serve them with the summons.In the case that the expert opinion or information submitted by the person, authority or association under in Paragraph 1 is cited by a party, it shall be regarded as the citing party's own statement.