my guess is -- keep the blade under 3"
ask a NJ cop

I've carried a Benchmade CQC-9 for 3 years now, and no problem. Auto knifes are a big no-no.
Eric

Here ya go...
New Jersey

                       Summary: General folders OK. Single-edged fixed blades may be.
                       Max length: Under 18 may not possess knife with 5" or longer blade, or 10" or
                       longer overall. No other apparent limitation.
                       Specifically illegal: gravity knife, switchblade knife, dagger, dirk, stiletto, or ballistic
                       knife "without any explainable lawful purpose" (i.e. an ill-defined exemption).
                       Manufacturers and sellers are not exempt.
                       Relevant laws: 2C:39-3.e 2C:39-9.d 2C:39-9.1 (Statutes, search for "knife" or
                       "knives")

Yes, but I got it at work, so I dont have the URL here. I think I went to Yahoo, and put in knife laws. This was one of the first 5 sites to come up.[bounce]
HTH
Eric

http://www.knifeart.com/kniflawbysta.html

Start with [url]www.state.nj.us[/url] and then hit the judiciary link at the top of the page.  This kind of url works with almost all of the XX state abbreviations.

Norm