Being a current LEO I feel i have some weight in the knife discussion. Yes what most of you are saying is right, A knife has sooo many uses while working. But saying that a knife is a great backup, I am only allowed to carry one sidearm, unlike a fair few other countries that carry at least 2 pistols. I wanted a quick draw knife, that was concealable, nothing I liked on the market so I did a bit of RnD. The idea of this design is if someone is going for your gun and you are fighting to keep it in the holster, this quick draw knife can be deployed with your left hand and cut the wrist of the attacking person. Law enforcement is all about having options and being able to try and do everything you can before you are forced to pull the trigger, which is why I carry around 12 Kg of uniform and equipment each shift, to provide options.
If still a very nice blade you came up with and I am sure the guy will be happy with it.
Here is the design I came up with, It sits behind my ammunition pouch, made of 5160, It is more of a concept piece so not finished too well and the sheath is a bit of PVC pipe, blade is held in place with a hole drilled in the blade and the PVC pushed into this hole, Works great.
Granted this blade is more designed for front line work then the FBI, tried to attach pics,not working, its the one in my avatar