(1) The commission shall, by way of preliminary investigation, investigate any alleged violation of the Nebraska Political Accountability and Disclosure Act, or any rule or regulation adopted and promulgated thereunder, upon:

(a) The receipt of a complaint signed under oath which contains at least a reasonable belief that a violation has occurred;

(b) The recommendation of the executive director; or

(c) The commission's own motion.

(2) For purposes of conducting preliminary investigations under the Nebraska Political Accountability and Disclosure Act, the commission shall have the powers possessed by the courts of this state to issue subpoenas, and the district court shall have jurisdiction to enforce such subpoenas.

(3) The executive director shall notify any person under investigation by the commission of the investigation and of the nature of the alleged violation within five days after the commencement of the investigation.

(4) Within fifteen days after the filing of a sworn complaint by a person alleging a violation, and every thirty days thereafter until the matter is terminated, the executive director shall notify the complainant and the alleged violator of the action taken to date by the commission together with the reasons for such action or for nonaction.

(5) Each governing body shall cooperate with the commission in the conduct of its investigations.