In 10 to 30 minutes of research on the internet, you can determine the risks of owning a witchblade in your state.
In 2 seconds I got these two links:
http://www.amatecon.com/switchblade.html THIS provides an easy quick reference chart listing most states.
http://home.netcom.com/~brlevine/sta-law.htm#S-W THIS cite provides actual excerpts of each State's laws regarding the carrying of switchblades.
These are general and cover all states. You should research for your own state. Read from several internet sites. Some states are clear, but for some states you will find that the internet articles have different opinions. Further research will usually clear things up.
More things to know:
IF ILLEGAL TO CARRY: Is it legal to have in the house, Is it legal to transport in a closed container, like a trunk, Is it legal to own one as a collector?
IF LEGAL TO CARRY: You probably must "display" the carry (so called "open carry"), Is there a restriction on the length of the blade.
If your state law does not mention switchblades, then switchblades will generally fall into the same category as a "dirk" or "dagger" or "gravity knife."
I have numerous switchblades, side and otf, and they are legal to open carry in Maryland, is very problematic in Virginia due to presumption of selling or bartering, and illegal to possess in Washington DC.
Switchblades are certainly cool, but most assisted openers open just as fast are are generally legal, and some folders, like my Microtech Amphibian manual and Camilus ?? open quicker than anything.