The vhf radio was placed in scan by one of our firefighters that had no clue that it was rebroadcasting on our DPS TG. We have no PL or DPL on the input side of the VHF and we were picking up a police department last night from around 10p.m. until 2 a.m. I highly doubt that Regional will accept our contract for voice dispatch with this kind of interference, and I also highly doubt the town of Sperry will place and preventative measures against this kind of interference on the system. I've been told that the reason for this is an interoperability issue because all the departments around us will need to reprogram their radios, and that the town does not want to pay to reprogram our VHF radios. If I had the RSS I would do it myself.