1. A. INTERVENTION OF RIGHT. Upon timely application anyone shall be permitted to intervene in an action:

   1. 1. When a statute confers an unconditional right to intervene; or
   2. 2. When the applicant claims an interest relating to the property or transaction which is the subject of the action and he is so situated that the disposition of the action may as a practical matter impair or impede his ability to protect that interest.

2. B. PERMISSIVE INTERVENTION. Upon timely application anyone may be permitted to intervene in an action:

   1. 1. When a statute confers a conditional right to intervene; or
   2. 2. When an applicant's claim or defense and the main action have a question of law or fact in common. When a party to an action relies for ground of claim or defense upon any statute or executive order administered by a federal or state governmental officer or agency or upon any regulation, order, requirement or agreement issued or made pursuant to the statute or executive order, the officer or agency upon timely application may be permitted to intervene in the action. In exercising its discretion the court shall consider whether the intervention will unduly delay or prejudice the adjudication of the rights of the original parties.
3. C. PROCEDURE. A person desiring to intervene shall serve a motion to intervene upon the parties as provided in Section 5 of this act. The motion shall state the grounds therefor and shall be accompanied by a pleading setting forth the claim or defense for which intervention is sought. If the motion to intervene is granted, the plaintiff or defendant, or both, may respond to the pleading of the intervenor within twenty (20) days after the date that the motion was granted unless the court prescribes a shorter time.
4. D. INTERVENTION BY STATE OF OKLAHOMA. In any action, suit, or proceeding to which the State of Oklahoma or any agency, officer, or employee thereof is not a party, wherein the constitutionality of any statute of Oklahoma affecting the public interest is drawn in question, the court shall certify such fact to the Attorney General of Oklahoma, and shall permit the State of Oklahoma to intervene for presentation of evidence, if evidence is otherwise admissible in the case, and for argument on the question of constitutionality. The State of Oklahoma shall, subject to the applicable provisions of law, have all the rights of a party and be subject to all liabilities of a party as to court costs to the extent necessary for a proper presentation of the facts and law relating to the question of constitutionality.

Laws 1984, SB 417, c. 164, § 26, eff. November 1, 1984.