Oregon Revised Statutes Procedure in Criminal Matters Generally § 146.107

(1) A medical examiner, deputy medical examiner or district attorney may enter any room, dwelling, building or other place in which the medical examiner, deputy medical examiner or district attorney has reasonable cause to believe that a body or evidence of the circumstances of death requiring investigation may be found.

(2) If refused entry, the medical examiner, deputy medical examiner or district attorney may apply to any judge authorized to issue search warrants for an order to enter such premises, search for and seize a body or any evidence of the cause or manner of death.

(3) Upon application supported by an affidavit setting forth facts and circumstances tending to show that a body or such evidence of death is in the place to be searched, the judge shall issue such order to enter and search and seize.

(4) To preserve evidence, a medical examiner, deputy medical examiner or district attorney may:

(5) No person shall enter upon the enclosures or areas specified in subsection (4) of this section without the permission of the medical examiner, deputy medical examiner or district attorney.