Oregon Revised Statutes Labor and Employment; Unlawful Discrimination § 654.206

(1) An inspection warrant shall be issued only upon cause, supported by affidavit, particularly describing the applicant's status in applying for the warrant hereunder, the statute, ordinance or regulation requiring or authorizing the inspection or investigation, the place of employment to be inspected or investigated and the purpose for which the inspection or investigation is to be made including the basis upon which cause exists to inspect. In addition, the affidavit shall contain either a statement that entry has been sought and refused or facts or circumstances reasonably showing that the purposes of the inspection or investigation might be frustrated if entry were sought without an inspection warrant.

(2) Cause shall be deemed to exist if reasonable legislative or administrative standards for conducting a routine, periodic or area inspection are satisfied with respect to the particular place of employment, or there is probable cause to believe that a condition of nonconformity with a safety or health statute, ordinance, regulation, rule, standard or order exists with respect to the particular place of employment, or an investigation is reasonably believed to be necessary in order to determine or verify the cause of an employee's death, injury or illness.