New York City's DA is a complete idiot and will bring you up on charges is my guess. From what I've been reading he apparently thinks that all one handed opening locking knives are gravity knives and should be illegal. My guess is his view of fixed blades isn't that they're legal either. NYC's laws on paper seem reasonable, but in practice the DA is alienating all knife users by trying to make it so basically every knife but a slipjoint is illegal. Doug Ritter and Knife Rights need to kick this guy's ass because up here in Western New York half the retailers won't ship to me even though I'm (thankfully) not under Cyrus Vance Moron's authority.
Okay, sorry for the rant, but I'm really tired of this guy. Point is, I would get either a two handed opening folder like a traditional lockback or a slipjoint of some sort just so the police don't hassle you.