dmr
Registered Abuser
dmr, i know that site very well, [some really good pics] and I am very sure the MTA knows about it [some of the contributors are probably employees 😀].
I kinda figured you knew it. I get the impression that Peggy D. (frequent contributor) is or was a MTA employee. There may be others too.
My biggest contribution to the site has been the stuff on the Las Vegas Monorail.
http://world.nycsubway.org/us/lasvegas/
Back then when I used to work down there, it took a brave soul to take a camera out, because you where just inviting your self to be robbed [seen this as a conductor too many times].
I will never forget my parents having a total cow when they learned I spent the majority of a Sunday joyriding the subways with my then-new used Mamiya SD. I was enraptured by the fact that I could shoot Tri-X without flash and get good shots, even in such places as subway stations. They read me the riot act regarding somebody killing me just to get the camera. This was about 1969 and I was somewhat gutsy for a 16 year old. 🙂
Here's one of the surviving shots from that shoot, scanned from an old print, negative long gone.

I think you hit the nail on the head, this guy must of mouthed off at the wrong cop at the wrong time to get him self in a jam, but because of his actions we all know for the record there is no law concerning photography on the subway at least.
The one thing I don't understand, not only on the subway, but other places, why are there almost never any "No Photography" signs or a circle-camera-slash icon posted? I would think that the Powers That Be would want to announce the fact, rather than have to enforce things after the fact.