Thats one thing I have never seen. I still have to use my radio shack scanner if I want to listen to maryland police or government radio. Its not encrypted so I don't see why it would work. But I have also heard that someone tried to make a an analog trunked system from dongles but they needed two. Couldn't the SDR listen to two frequencies at once? I have an SDRPlay so I know it does alot more then the dongles but yet to see SDR replace a scanner.