Go to multnomah sheriff sheriffs office at
12240 NE Glisan St
Portland, OR
(503) 255-3600
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§ 166.370¹
Possession of firearm or dangerous weapon in public building or court facility
(1) Any person who intentionally possesses a loaded or unloaded firearm or any other instrument used as a dangerous weapon, while in or on a public building, shall upon conviction be guilty of a Class C felony.
Subsection (1) of this section does not apply to:
...
(d) A person who is licensed under ORS 166.291 (Issuance of concealed handgun license) and 166.292 (Procedure for issuing) to carry a concealed handgun.
So, OC or CC
("or any other instrument used as a dangerous weapon") with your CHL.
But be aware of ORS 166.380:
§ 166.380¹
Examination of firearm by peace officer
(1) A peace officer may examine a firearm possessed by anyone on the person while in or on a public building to determine whether the firearm is a loaded firearm.
(2) Refusal by a person to allow the examination authorized by subsection (1) of this section constitutes reason to believe that the person has committed a crime and the peace officer may make an arrest pursuant to ORS 133.310 (Authority of peace officer to arrest without warrant). [1969 c.705 §3]
So, a LEO will use ORS.370 as RAS to detain, you have to show CHL to prove you are exempt.
The CHL also allows loaded carry, so ORS 166.380 should not apply, but...
The LEO still wants to "examine" your firearm to determine if it is loaded (in a public building).
You quickly verbally concede that it is loaded (again, CHL allows this), does that nullify the inspection? It should.
IANAL, so correct me if I have this wrong.