Apparently never.
Glock 22? A gun! Photograph of a Glock 22? A gun! T-Shirt with the Glock Logo on it? A gun! Pointing a finger at someone? A gun! Stick figure showing someone being squirted with a water hose? A gun! A pen, bent and modified to look like an item with the word ‘gun’ in it? A gun!
What kind of sick society allows mere images, illustrations, or a word to equate to something it’s most definitely not? In this instance, the school is claiming that the pen taped up and called a ‘tattoo gun’ could cause bodily harm. Well, so could the chairs, pencils, rulers, scissors, fists, teeth, ceiling tiles, electrical outlets, cafeteria trays, gravity, swings, gym equipment, et cetera.
We’ve ignored the real harm and simply declared anything some random idiot thinks could possibly cause harm with absolutely no logical reasoning to back it up as perfectly legitimate.