Short answer, No. Provided that you keep it in your pocket and out of plain sight. As you pointed out, the knife in question is under 4 inches,non-locking and is generally viewed as a tool and not as a weapon. However,there is always the possibility that you MAY find yourself the subject of a search. And the officer involved MAY interpret the knife to be a DANGEROUS INSTRUMENT. Like most of us here, and especially those that live and work in NYC, there are many valid reasons to carry a knife. BUT, NYC and the NYPD is NOT KNIFE FRIENDLY AT ALL. Personally, when and if I decide to carry an edge in NYC, the biggest knife I will carry is no more than three inches and non-locking/slip-joint. Mostly a swiss army type knife. And if I anticipate the likelihood of police contact, ie;the subway,govt buildings,either go bladeless or something like a Victorinox classic or leatherman micra. Its also VERY IMPORTANT to articulate clearly the reason you are carrying said knife. "Just in case" even though true, usually isnt good enough. I use it for opening mail,breaking down cardboard boxes,slicing fruit,cutting string and twine,trimming my nails,fixing my eyeglasses...these really are the reasons I carry a SAK.