Somebody at the local gun shows has been selling these things, and it could create a potential problem for the unwary buyer. You see, that's not an ordinary pocket holster. Thanks to the National Firearms Act of 1934, it's been imbued with special powers necessitating registration and taxation.
What makes it different? It's designed so that the gun can be fired without removing it from the holster. As such, it falls under the same restrictions as cane guns, Stinger pens, and the infamous H&K MP5 briefcase. Walking around with your gun in one of these is treated with the same gravity as owning an unregistered machine gun.
I'm not being snarky here. True, you've known me to be facetious in the past. It's a personality quirk of mine, but I am not being a snickerpuss here.