Key phrase there is using them for work. If they ever ask, never say you carry for self defense, that's a sure way to earn an arrest or desk appearance ticket.
NYC code also does not allow for knives to be visible. Cops will arrest or ticket for even the pocket clip showing. They also will do the same for a knife that they can open with the application of centrifugal force. They can usually take a loose lock back like a Spyderco and flick their wrist to open it. Now you're charged with possession of a gravity knife, that's serious.
Oh I used to be disgusted, but now I try to be amused-E.Costello
'01 Kawasaki W650, '05 Yamaha XT225