I live on Long Island in Nassau County, with a 40 minute train commute to school in the city. Anywhere on Long Island, clips aren't a problem, I've never had or heard of a single knife issue on Long Island. My big CRKT m16 is the largest folder I own, and it's still under 4" so I'm good to carry what I please. But for the city, it's either a slipjoint, or a leatherman (I'm a fine arts and tv production student, leatherman seems to get more use time). I NEVER dare to clip anything to my pocket. I debated clipping a pen I carry to my pocket so I don't lose it when I sit down, but if cops are as jumpy as I heard they are then I'll just skip the potential time wasting of getting pulled over during my commute by leaving it in my backpack. If you have any more questions, please feel free to ask. I'm a very experienced NYC goer, so I'm happy to help as much as I can!
my current city favorites are:
leathermans
SAKs
Boker Compliance
Best,
Trev