It's quite humorous how a training manual for law enforcement and security has become so contentious so early in the game.
Personally, I think that it is important that those sworn to protect us are given the information to do so.
The funny thing is that it isn't really about laws. With rare exception (ie., State Laws), most covert edged weapons are legal to buy, sell, or own - as it should be. It only becomes a problem when people put others at risk.
As an example, when your family flies, it is important that the people manning the airport security are given the tools, training and knowledge to stop others who pose a threat to your family. Personal security often comes down to all or nothing. Either everyone goes armed or nobody does.
I appreciate the negative review from eda-Koppo as it reinforces our right to free speech, (it has also resulted in an increase in book sales). Thankfully, all other reviews to date have taken the opposite stand and have commented on the quality research and content.