Nothing in this paragraph shall be construed to limit the authority of the appropriate office to issue a subpoena to compel an expert witness to appear in the same manner as any other witness;
Substitution of parties pursuant to Section 1081, 1082, 1083 or 2025 of this title does not affect the right to use depositions previously taken. When an action has been brought in this state or in any court of the United States or of any other state and another action involving the same subject matter is afterward brought between the same parties or their representatives or successors in interest, all depositions lawfully taken and duly filed in the former action may be used in the latter as if originally taken therefor.
A deposition previously taken may also be used as permitted by the Oklahoma Evidence Code.
Okla. Stat. tit. 12, § 3232