I've walked through security with a super sharp 4" serated rigging knife.
It was exposed and visible in a mesh bag, at the very front, anyone could see it.
Nobody noticed a thing. I was shocked when I opened that bag at destination, and there it was, sitting there. I'd forgotten, and the TSA
hadn't noticed either.
security cought it, as I thought they would, but the other, unnamed, airport, didn't notice a thing. They made me take my shoes off though.