It's like they forget they exist. A few days ago a neighboring county (Pasco) helicopter came into my county to look for a missing endangered subject, and a sergeant from my city (Clearwater) commented that they "probably won't be able to communicate with them on the radio." So there were three agencies, Pasco SO, Pinellas SO, and Clearwater PD on three different radio systems that all apparently forgot that there are 800Mhz analog interop frequencies available.