A student who is determined to have carried a firearm onto, or to have possessed a firearm on, public elementary or secondary school premises, public school-provided transportation, or areas of facilities while being used for school events, shall be expelled from school for not less than one year under RCW 28A.600.010. The superintendent of the school district may modify the expulsion of a student on a case-by-case basis. “Firearm” means a firearm as defined in 18 U.S.C. sec. 921, and a “firearm” as defined in RCW9.41.010. A school district may suspend or expel a student for up to one year if the student acts with malice under RCW9A.04.110 and displays an instrument that appeared (appears) to be a firearm. School officials shall notify the student’s parents or guardians and the appropriate law enforcement agency of known or suspected violations of this policy.