Oregon Revised Statutes Procedure in Criminal Matters Generally § 132.430

(1) When a person has been held to answer a criminal charge and the indictment in relation thereto is not found “a true bill,” it must be indorsed “not a true bill,” which indorsement must be signed by the foreman and filed with the clerk of the court, in whose office it shall remain a public record. In the case of an indictment not found “a true bill” against a person not so held, the same, together with the minutes of the evidence in relation thereto, must be destroyed by the grand jury.

(2) When an indictment indorsed “not a true bill” has been filed with the clerk of the court, the effect thereof is to dismiss the charge; and the same cannot be again submitted to or inquired of by the grand jury unless the court so orders.