True, but a far smarter option is to not be judged by 12 OR carried by 6. If I was considering vacationing someplace where I felt I needed to carry a knife for personal safety, I’d revisit and revise my list of vacation destinations and go somewhere else. My personal experience with border station grunts is that they’re an unfriendly, unhappy, hostile bunch. Their behavior always made me suspect each of them had a large pinecone up his butt. The one and only attitude/course of action I ever found sensible when dealing with them was making it as easy as possible for them to let me pass through and then get the hell away from them ASAP. BTW... on my international travel experiences, I always found the US grunts to be the worst of all to deal with (when I was coming home to my own country!).
As regards taking a ceramic blade through border crossings in the hope it won’t be detected by the grunts.... I think the probability of that resulting in all kinds of costly and monumentally unpleasant trouble is astronomical. As suggested above, just buy a knife when you get where you’re going and then dump it before you cross any border stations on the way home.