unless all the knives are anti stab you wont stop stabbings plus i am sure you could still dtick that in some one.
Homemade weapons could be the thing then if this knife works.
Stabbing deaths hit a record high of 322 in the UK last year, according to the government. Most knives used in such attacks are from the kitchen, former Metropolitan Police Commissioner Sir Ian Blair suggested.BBC news article
As a parent it'd have to be a good choice for the kitchen just for
being slightly less dangerous for kids than the normal pointed knife. As far as the petty criminal and general waste of DNA is concerned...they'll
always get access to a weapon. It's unlikely to make much difference. 
Denying the antagonists access to one device will only direct them to find another - and there are plenty of ways to inflict harm on a person.
I'm sitting at my safe desk in my safe office and I can easily use all of my fingers and toes counting items I could use to do somebody in. They may not all be as practical as a kitchen knife - but there's nothing practical about murder.
edit to add: although.... as an after thought - maybe knives are the way to cure violence

Originally posted by Kandinsky
reply to post by Republican08
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Question is why so many kids want to carry knives? Still...I hope the guy makes some money for a good idea. It beats all the media whining about it, at least he's tried to do something about it.![]()
I think it is more important to find out why everyone wants to stab one another.
I have thought of this often in the US. We have the "Drive-by" shooting epidemic that gangsters like to use for one another. It is fairly anonymous, and you don't have to stay around and get blood on your hands, or hear the moans, or see the eyes go dim. I wonder how many of those gangsters would have the cahones to use a knife? It takes a different type of killer to do it up close and personal with their own hands.