ORS 166.275: Possession of weapons by inmates of institutions.

Any person committed to any institution who, while under the jurisdiction of any institution or while being conveyed to or from any institution, possesses or carries upon the person, or has under the custody or control of the person any dangerous instrument, or any weapon including but not limited to any blackjack, slingshot, billy, sand club, metal knuckles, explosive substance, dirk, dagger, sharp instrument, pistol, revolver or other firearm without lawful authority, is guilty of a felony and upon conviction thereof shall be punished by imprisonment in the custody of the Department of Corrections for a term not more than 20 years.