Where is it illegal to RF physics of a non metal?
North Korea maybe?
thats just trying to scare people away from posting in this thread. its completely ridiculous. It has a chilling effect on the discussion. And it seems like someone is frustrated because their secret weapon is revealed (just a bit, I am not completely serious here).
if its possible then people should be aware so countermeasures can be developed and used appropriately. Otherwise it can proliferate and used to gather data on a large scale unimpeded.
And I also listed peaceful/non espionage applications.
Copper and aluminum are popular choices for antennas. I don't think most metal detectors will pick them up in small amounts. (RFID tags I believe are just metalized).
The problem with exotic materials like carbon is that maybe X-ray might have trouble picking it up (if automated to look for certain things), and that more sensitive metal detectors might also have trouble picking them up ( i believe stuff exists for nonferrous metals).
Also, some people might have the illusion of safety scanning a plastic object for metal, and trust the plastic object, especially when a NLJD is not available (since they cost north of 5000$ typically)