Oregon Revised Statutes Procedure in Criminal Matters Generally § 153.080

(a) Testimony may not be presented by affidavit or declaration under the provisions of this section unless the court has adopted rules providing procedures for the introduction and use of testimony by affidavit or declaration.

(b) The court shall allow testimony by affidavit or declaration under this section only upon receiving a signed statement from the defendant waiving the right to have the testimony presented orally in court.

(c) Testimony by affidavit or declaration under this section is not subject to objection as hearsay.

(d) A statement signed by the defendant under paragraph (b) of this subsection does not constitute a waiver of trial unless the affidavit or declaration specifically so provides.

(e) Nothing in this section requires that the defendant or any other witness waive the right to appear if other testimony is introduced by affidavit or declaration as provided in this section.