Code of Civil Procedure Article 69

An advocate shall produce a Power of Attorney upon conducting the initial act of litigation, except where the advocate is retained by a party orally and such retention is entered in the court record by the court clerk or where the advocate is appointed by the court or the presiding judge in accordance with the applicable law.The retention or appointment, in accordance with the provisions of the preceding paragraph, shall be made separately in each court instance, except when the party has indicated in the Power of Attorney that the retention for a specific action takes effect in all of the court instances and that such Power of Attorney has been duly notarized.