Maybe its an old rules of conduct sheet? I just looked it up online STA Rules of Conduct, and it appears to have been moved to #13 and reworded appropriately.
-Thor13. Carrying, exhibiting, displaying, or drawing any firearm, dagger, sword, knife or other cutting or stabbing instrument, club, or any other weapon apparently capable of producing bodily harm, in a manner, under circumstances, and at a time and place that either manifests an intent to intimidate another or that warrants alarm for the safety of other persons, unless otherwise authorized by law (RCW 9.41.270);
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