A. A subpoena requiring the attendance of a witness at a trial or hearing conducted under the Oklahoma Medicaid False Claims Act may be served at any place in Oklahoma.

B. A civil action under Section 5053.2 of this title may not be brought:

C. If the state elects to intervene and proceed with an action brought under Section 5053.2 of this title, the state may file its own complaint or amend the complaint of a person who has brought an action under Section 5053.2 of this title to clarify or add detail to the claims in which the state is intervening and to add any additional claims with respect to which the state contends it is entitled to relief. For statute of limitations purposes, any such state pleading shall relate back to the filing date of the complaint of the person who originally brought the action to the extent that the claim of the state arises out of the conduct, transactions or occurrences set forth, or attempted to be set forth, in the prior complaint of the person.

D. In any action brought under Section 5053.2 of this title, this state shall be required to prove all essential elements of the cause of action, including damages, by a preponderance of the evidence.

E. Notwithstanding any other provision of law, a final judgment rendered in favor of this state in any criminal proceeding charging fraud or false statements, whether upon a verdict after trial or upon a plea of guilty or nolo contendere, shall estop the defendant from denying the essential elements of the offense in any action which involves the same transaction as in the criminal proceeding and which is brought under the Oklahoma Medicaid False Claims Act.