Couldn't that potentially be used by say terrorist to bring a weapon past TSA and onto an airplane? Or even 3D printing of any weapon. Would TSA be able to detect that? They already are kinda bad at their jobs.
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The only thing I can think of is making the materials that are strong enough to handle it only available to the military and the factories or whatever that use it. But there would still be a way to get those mistrals, but at least it would be hard for normal people to get them.