(a) The identity and location of a potential party or witness in a contested case may be obtained from a communication or other paper in a party's possession, custody, or control.
(b) A party may be required to produce and permit the inspection and copying of a report, including factual observations and opinions, of an expert who will be called as a witness.
(c) This section does not extend to other communications:
(1) made after the occurrence or transaction on which the contested case is based;
(2) made in connection with the prosecution, investigation, or defense of the contested case or the circumstances from which the case arose; and
(3) that are:
(A) written statements of witnesses;
(B) in writing and between agents, representatives, or employees of a party; or
(C) between a party and the party's agent, representative, or employee.