Oregon Revised Statutes Procedure in Criminal Matters Generally § 137.769

(1) When a defendant is examined under ORS 137.767, the defendant may retain a psychiatrist, psychologist or other expert to perform an examination on the defendant's behalf. A psychiatrist, psychologist or other expert retained by the defendant must be provided reasonable access to:

(2) If the defendant is financially eligible for appointed counsel at state expense, the defendant may request preauthorization to incur the fees and expenses of a psychiatrist, psychologist or other expert as provided in ORS 135.055 (3).