The RPS units in St. Clair County can be heard on the VHF DMR system they use. The system isn't technically "encrypted" but even a scanner with DMR capabilities won't hear it, or it will pass through as garbled digital mess. You can hear the dispatcher talk with all units on VHF analog. Every once in a while, you will hear a dept transmit on VHF analog to acknowledge a response, but that's it.