Stupid questions -- are the comms you're hearing on Troop B talkgroups, system-wide talkgroups, or Troop A talkgroups? What frequencies are being used as voice channels?
NJSP has a site licensed in Waterford Township which uses five Troop B frequencies: 856.9625, 857.9625, 858.9625, 859.9625, and 860.9625. Reference WNXZ718. They've had the license for quite some time now; on the rare occasions I've been through that area, none recently, I haven't heard anything on those frequencies.
Jim