Bobco,
I have never seen or heard of such a law against tracking at night (without weapon).
But just to make sure

I just got off the phone with a Suffolk County DEC officer - and he also gave it the green light.
I also hunt upstate every year and have not heard of it up there also. It is common practice for myself and others to do this.
Maybe in your area there is a lot of night jacking, and sometimes the local officer in small towns can be a real pain in the arse