Washington Revised Code Title 28A. Common School Provisions § 28A.635.020. Willfully disobeying school administrative personnel or refusing to leave public property, violations, when--Penalty

(1) It shall be unlawful for any person to willfully disobey the order of the chief administrative officer of a public school district, or of an authorized designee of any such administrator, to leave any motor vehicle, building, grounds or other property which is owned, operated or controlled by the school district if the person so ordered is under the influence of alcohol or drugs, or is committing, threatens to imminently commit or incites another to imminently commit any act which would disturb or interfere with or obstruct any lawful task, function, process or procedure of the school district or any lawful task, function, process or procedure of any student, official, employee or invitee of the school district. The order of a school officer or designee acting pursuant to this subsection shall be valid if the officer or designee reasonably believes a person ordered to leave is under the influence of alcohol or drugs, is committing acts, or is creating a disturbance as provided in this subsection.

(2) It shall be unlawful for any person to refuse to leave public property immediately adjacent to a building, grounds or property which is owned, operated or controlled by a school district when ordered to do so by a law enforcement officer if such person is engaging in conduct which creates a substantial risk of causing injury to any person, or substantial harm to property, or such conduct amounts to disorderly conduct under RCW 9A.84.030.

(3) Nothing in this section shall be construed to prohibit or penalize activity consisting of the lawful exercise of freedom of speech, freedom of press and the right to peaceably assemble and petition the government for a redress of grievances: PROVIDED, That such activity neither does or threatens imminently to materially disturb or interfere with or obstruct any lawful task, function, process or procedure of the school district, or any lawful task, function, process or procedure of any student, official, employee or invitee of the school district: PROVIDED FURTHER, That such activity is not conducted in violation of a prohibition or limitation lawfully imposed by the school district upon entry or use of any motor vehicle, building, grounds or other property which is owned, operated or controlled by the school district.

(4) Any person guilty of violating this section shall be deemed guilty of a gross misdemeanor punishable as provided in chapter 9A.20 RCW.