Bullied Teen Stabs and kills tormentor

[spin]

17. Knives are regulated in many states. ...

Knife legislation

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United States of America

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State and local laws
Each American state also has laws that govern the legality of carrying weapons, either concealed or openly, and these laws explicitly or implicitly cover various types of knives. Some states go beyond this, and criminalize mere possession of certain types of knives. Other states prohibit the possession and/or the concealed carrying of knives that feature blade styles or features sufficient to transform them into "dangerous weapons"[83][84] or "deadly weapons", i.e. knives either optimized for lethality against humans or designed for and readily capable of causing death or serious bodily injury.[83][85] These frequently include knives with specific blade styles with a historical connection to violence or assassination, including thrusting knives such as the dirk, poignard, and stiletto, the bowie knife, and double-edged knives with crossguards designed for knife fighting such as the dagger.[83][86] Some states make the carrying or possession of any dangerous or deadly weapon with intent to unlawfully harm another a crime.[83]
http://en.m.wikipedia.org/wiki/Knife_legislation#State_and_local_laws

Note: the section on knife laws in the UK is very interesting. I'm sure if the gun control advocates ever succeed in passing gun laws in this nation similar to those in the UK, they will push for strong knife control laws.

Of course regulations are just words on paper. A person can decide to ignore the law if he chooses and many criminals do.