Section 618.521 - Investigative demand; petition to modify(1) When it appears to the prosecuting attorney that a person has committed or is committing a security seal violation, the attorney may execute in writing and cause to be served an investigative demand upon any person who is believed to have information, documentary material or physical evidence relevant to the alleged violation. The investigative demand shall require such person, under oath or otherwise, to appear and testify or to produce relevant documentary material or physical evidence for examination, at such reasonable time and place as may be stated in the investigative demand or to do any of the foregoing, concerning the advertisement, sale or offering for sale of any goods or services or the conduct of any trade or commerce which is the subject matter of the investigation.(2) At any time before the return date specified in an investigative demand, or within 20 days after the demand has been served, whichever period is shorter, a petition to extend the return date, or to modify or set aside the demand, stating good cause including privileged material, may be filed in the appropriate court.