Re. MET bullies
I discovered recently that a lot of innocent materials result in mail tampering, pyrolytic graphite is one of them.
No idea why as it is not toxic, flammable or a drugs precursor but if you order it from certain places the post will get delayed and/or opened.
It would be interesting to see what it is about this specific material that upsets Ze Plod, from what I can tell it barely shows up on X-rays at all.
Perhaps some samples display strange properties when exposed to the magnetic fields of some portal type scanners which trips an alarm ?