(a) Commencement of discovery. Discovery may begin when SOAH acquires jurisdiction under §155.51 of this chapter.(b) Discovery period. The discovery period ends ten days before the hearing on the merits begins, unless otherwise ordered by the judge or agreed by the parties.(c) Discovery rights. Parties have the discovery rights provided in this section, the APA, and the TRCP, other than the provisions relating to discovery control plans and except as modified by this chapter. Discovery rights may be modified or changed by the judge. For cases not adjudicated under the APA, the judge will determine what discovery, if any, will be permitted.(d) Discovery requests, responses, and documents produced in discovery shall not be filed with SOAH, except as provided in §155.259 of this chapter.