Or. Rev. Stat. § 221.277 – Violation of city parking ordinance; affirmative defense

(1) It is an offense to be the registered owner of a motor vehicle parked in violation of a city ordinance.
(2) It is an affirmative defense to a prosecution of the registered owner of a motor vehicle under subsection (1) of this section that the use of the vehicle was not authorized by the owner, either expressly or by implication.

[1995 c.533 §3]