i still have a few of these "Executive Letter Openers" for places i can't carry, the back side is concave and a piece of Scotch tape keeps it on the inside forearm no problem and it goes through metal detectors too 
i still have a few of these "Executive Letter Openers" for places i can't carry, the back side is concave and a piece of Scotch tape keeps it on the inside forearm no problem and it goes through metal detectors too eBay has those composit knives for about 10 bucks.
personally,I don’t plan on getting That close to these animals.
LOL ! We must be kindred spirits !