I realize that whacking moles is great fun; and posturing about it afterwards is even better; but surely attempts to control the sales of an otherwise legal item that hits some vague standard of excessive smallitude are transparently insane?
Doubly so when, in order to function the contraband you are worried about has to emit some fairly distinctive RF chatter?
The minimum metal models presumably sail right past whatever antique magnetometers and/or faith based anal dowsing apparatus seemed adequate to keep Gordon Gekko phones at bay; but that’s a problem solvable by some comparatively inexpensive RF gear; not a futile war against the tides of fleabay.