If you search here its been talked about before, I thinkg they are still on a LTR/Passport system
The "home" channel on the LTR passport system they use is 464.3125. 95% of the security traffic can probably be heard on this freq.
This system cannot be "scanned" by any scanner, but you can monitor that freq. like any other conventional freq. and hear most of the "action"
The only problem is you also have to listen to the annoying keyups every second or so.
The entire system is here:
http://www.radioreference.com/apps/db/?fccCallsign=KXN559
Location 5 freqs are the Passport system freqs.
5 451.18750000 11K3F3E FB2 1 0 20.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 451.18750000 11K2F3E FB2 1 0 20.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 451.18750000 20K0F3E FB2 1 0 20.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 452.22500000 20K0F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 452.22500000 11K3F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 452.22500000 11K2F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 461.80000000 11K2F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 461.80000000 20K0F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 461.80000000 11K3F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 464.31250000 11K3F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 464.31250000 11K2F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
5 464.31250000 20K0F3E FB2 1 0 50.000 41.41428 -72.83428 NORTH HAVEN NEW HAVEN CT
Happy monitoring,
Bob