Seattle Center Campus Rules said:3. Weapons
It is prohibited to:
a. Sell, manufacture, purchase, possess or carry any blackjack, sand-club, metal knuckles, switchblade knife, chako sticks, or throwing stars; or
b. Carry concealed or unconcealed on his or her person any dangerous knife unless used as a tool for work by Seattle Center employees or their authorized agents, or carry concealed on his or her person any weapon. Seattle Center employees are subject to the Seattle Center Employees Firearm Policy.
c. Possess a firearm on the campus, except that such restriction shall not apply to any pistol in the possession of a person licensed under RCW 9.41.070 or exempt from the licensing requirement by RCW 9.41.060.