In a move aimed at reducing violence in the lead up to the coming world Olympics, China has decreed that citizens must register their identities when buying potentially dangerous knives.
"The targeted daggers include those with blood grooves, lock-knives, and knives with blades measuring over 22 centimeters, the ministry said in a circular posted on its website, www.mps.gov.cn."Probably a good idea, a simple scuffle can quickly escalate into a very bloody affair with the help of a knife. Not that only "dangerous" knives can cause serious injuries. Sadly, US citizens can only dream of this kind of law, as even firearms regulations in the states are lax. link