Not to bring up an old point, but I lived in NY for about 10 years, 4 of which were spent in the true north part of the state (rest in the Rochester area), during which period I went to NYC less than 5 times, each time for a short, specific event. I carried the same folder the entire time, unaware that simply showing the clip portion would be enough for a cop to stop me.
Now I live in TX. I carry two folders every day, along with a flashlight. Hell, I even forgot about them when I went into a 6 Flags the other day in Georgia, and saw the metal detectors. I merely dropped the obvious folder into my pocket, commented how I had a relatively large metal flashlight that would set off the detector, walked through, set it off, showed my flashlight, and continued.
In short, I probably won't go to any more amusement parks unless others really want to go, and I most likely will never set foot in NY again, except to pick up the last of my things that i left at my parents' house. Who, by the way, are also moving out of NYS.
Get A Lawyer. Talk amongst your peers, your friends, help spread a common-sense atmosphere. Every time someone is shocked by every day carry of a pocket knife is a time to educate someone.
If asked why I moved, many assume it was the weather, and I point out why. Specifically pointing out that it was NOT due to the weather, a misguided notion that many in NY cling to.
::EDIT:: Another event was my friend at a fair (not big city, not rural, but somewhere in between) actually had a cop reach into his pocket and take his knife without any warning. As in all of a sudden my friend just felt a hand taking his knife. In the end the knife was removed, probably because my friend is among the most level-headed people I know. But along with that, I know several people who have instincts that result in anyone pulling anything like that on them experiencing a large amount of pain in their wrists, and possibly other parts of their body, as victim defends themselves. I seriously hope the cop that did that never does that again, as one day they will try that on someone who will defend themselves.