So it comes down to how to even make faraday cage bags or body armour illegal...I mean, when does an ESD bag used to ship PC components become a "terrorist anti-EMP device", or when does a piece of sheet metal with a zamak coating become "body armour"?
When it is expedient, or convenient, or hells even just amusing to those in control of the system. For reference here, look at the shitstorm related to 3d printed guns.
Any freedom or privilege you enjoy by law today can disappear by law tomorrow.
And it doesn't even take that much really to provoke that change.
There's more to add here, particularly in relation to "open carry" bullshit. I've been thinking about those guys recently and I'm increasingly suspecting that what these assholes want is just to provoke a gunfight by their presence (Scaring someone enough, pissing of the wrong cop,whatever.) as an excuse to unload in a public place. Or they may be a westboro baptist situation and are actually proving the point for gun control advocates just by wandering around.
God, don't even get me started on those fucking morons who open carry long arms...especially the double-retarded ones who do it for "protest". I mean jesus fucking christ, I can see carrying a long arm when one is out deep in the woods, or cased on the way to the range, but bringing a rifle or shotgun to bear on an assailant in public is too fucking slow for effective self defense.
Anyway, I think my prior point was mainly, how do you legislate banning basic materials? I mean, I can see illegalising using
a piece of sheet metal as armour, or using an ESD bag as an anti-emp device. But simply illegalising the materials themselves? I can't think of how you'd do it...it'd be like illegalising plumbing parts in order to curb home made submachine guns.