As provided under RCW 28A.600.420:

(1) A school district must expel a student for no less than one year if the district has determined that the student has carried or possessed a firearm on school premises, school-provided transportation, or areas of facilities while being used exclusively by public schools. The school district superintendent may modify the expulsion on a case-by-case basis.

(2) A school district may suspend or expel a student for up to one year if the student acts with malice, as defined under RCW 9A.04.110, and displays an instrument that appears to be a firearm on school premises, school-provided transportation, or areas of facilities while being used exclusively by public schools.

(3) This section does not apply to:

(a) Any student while engaged in military education authorized by the school district in which rifles are used;

(b) Any student while involved in a convention, showing, demonstration, lecture, or firearms safety course authorized by the school district in which the rifles of collectors or instructors are handled or displayed; or

(c) Any student while participating in a rifle competition authorized by the school district.