It is certainly always the best thing is to check your local state's compiled laws annotated. The above link appears to be fully up to date -- it's just edited for relevance to knives and blades only.
If the OP is truly concerned, or has trouble understanding the laws of his state, he should contact an attorney licensed in that jurisdiction.
It isn't fully up to date. For example:
1.) It took about 5 seconds to see the discrepancy in the description of Texas' law (I just moved out of Texas after having been there about 20 years). The write-up on that site didn't take into account the change in wording related to assisted knives, which was signed into law in the last year or so.
2.) The Federal Switchblade Act of 1958 (which prohibits shipment of automatic knives across state lines) was recently amended to more accurately define what a switchblade is (specifically, it makes clear that assisted-openers aren't switchblades). That hasn't been updated on the site either. And several other states have also made similar changes recently, many of which relied upon (and copied verbatim) the 'accepted' definition of 'switchblade' in the Federal Switchblade Act.
3.) Quite notably, New Hampshire just made some HUGE changes to their knife laws (essentially did away with most restrictions). That's also not reflected in the above-referenced site.
The above examples are just what I've looked up so far, in a few minutes' time.
Weapons laws have been changing A LOT in recent years. It would be difficult, if not impossible, for the admins of one particular site to keep up with it all. They'd do better to provide direct links to the states' relevant legislative sites, as opposed to summarizing and/or excerpting text from whatever they looked up, however long ago.
I'd still recommend going to the bonafide, true legal sources first.