RULE 24. INTERVENTION.
Rule 24.01 Intervention as of Right.
Upon timely application anyone shall be permitted to intervene in an action: (1) when a statute confers an unconditional right to intervene; or (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, unless the applicant's interest is adequately represented by existing parties; or (3) by stipulation of all the parties.
Rule 24.02 Permissive Intervention.
Upon timely application anyone may be permitted to intervene in an action: (1) when a statute confers a conditional right to intervene; or (2) when an applicant's claim or defense and the main action have a question of law or fact in common. In exercising discretion the court shall consider whether or not the intervention will unduly delay or prejudice the adjudication of the rights of the original parties.
Rule 24.03 Procedure.
A person desiring to intervene shall serve a motion to intervene upon the parties as provided in Rule 5. 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. The same procedure shall be followed when a statute gives a right to intervene.
Rule 24.04 Notice to Attorney General When Statute, Rule or Regulation Is Questioned.
When the validity of a statute of this state or an administrative rule or regulation of this state is drawn in question in any action to which the state or an officer or agency is not a party, the court shall require that notice be given the attorney general, specifying the pertinent statute, rule or regulation.