Oregon Revised Statutes Trade Regulations and Practices § 646.750

(1) When it appears to the Attorney General that a person has engaged in, is engaging in, or is about to engage in any act or practice declared to be unlawful by ORS 646.725 or 646.730, the Attorney General may execute in writing and cause to be served an investigative demand upon any person who is believed to have documentary material or information relevant to the alleged or suspected violation. The investigative demand shall require such person to produce relevant documentary material for examination and copying or reproduction, to answer in writing written interrogatories, to give oral testimony concerning documentary material or information, or to furnish any combination of such material, answers or testimony under penalty of perjury, at such reasonable time and place as may be stated in the investigative demand.

(2) At any time before the return day specified in the investigative demand, or within 20 days after the demand has been served whichever time is shorter, a petition to extend the return date, or to modify or set aside the demand, stating good cause, may be filed in the appropriate court.

(3) The investigative demand shall state the nature of the conduct constituting the alleged antitrust violation under investigation and the provisions of law believed to be applicable thereto.