Oregon Revised Statutes Remedies and Special Actions and Proceedings § 34.365

(1) Any court of the State of Oregon may authorize the filing of a petition for a writ of habeas corpus by or on behalf of any person imprisoned or otherwise restrained of liberty by virtue of a charge or conviction of crime without payment of the filing fees therefor, if such person presents to the court or judge thereof satisfactory proof, by affidavit and as otherwise required by such judge, that the person is unable to pay such fees.

(2) Notwithstanding the fact that a court has authorized the filing of a petition without payment of the filing fee required by ORS 34.340, the fee may be drawn from, or charged against, the plaintiff's trust account if the plaintiff is an inmate in a correctional facility.