Is this really necessary? In the UK, knives are being sold to deter people from stabbing one another. John Cornock, an industrial designer, invented these utensils that are claimed to make it "almost impossible" to stab someone to death with them. Maybe. But couldn't someone still cut you up with the sharp edge?
These are expected to sell at a price point of around £40-50. If you are really concerned about someone in your household stabbing you to death with your kitchen knives, maybe you should rethink your choice of housemates.