I didn't hear about this specific case , so thanks for the link. I'm from upstate NY and just began working in NYC 3 months ago.
In my home town it's very normal to carry a pocket knife clipped to your pocket or inside a belt case, so imagine how I felt when I had to start carrying only small slipjoints.
I carry slipjoints all the time... even before working in NYC, but now I can never carry anything else. I was carrying a small yellow handled traditional knife the other day with a locking blade and decided to stop carrying it...
I can also tell anyone planning to visit NYC and travel the subway system that the police are very "active" and do searches at random. Just last week in the Times Square station a man walking next to me was detained by police. He looked no more suspicious than me , just a middle aged guy going to work.
I've seen police set up tables in Penn, Grand Central and Times Sqaure Stations so they can empty backpacks and brief cases.