Here in the United KIngdom, I have a genuine sgian dubh, but I have not worn it for several years. Long before 9/11 it was confiscated when I was flying from Aberdeen to London and I was told by the airport police in Aberdeen (not the baggage checkers) that it was classified as an illegal and an offensive weapon - that was after they had measured the blade and found it to be 1" too long!! It was eventually returned to me after the flight, with the warning that I should not wear it outside of my own home.

On my next visit to Scotland, I purchased a faux sgian dubh which I always wear now. Being a law-abiding soul, with no need or wish to carry a 'blade', I have no problem with wearing the faux one - only I know what it is!

Actually, strictly speaking that is not quite true. I have been asked several times, mostly at museums and art galleries, if it is a genuine sgian dubh and I have been obliged to show it before being admitted.