i have a dual trucking radio ,radio shack "PRO-2052",but the PCSO,and the local fire/ems calfire dont trunk..if thats a term..lol..they went to a freq i just didnt have in my scanner..i had found it on radiorefrence.com..but by the time i got it input'd..the incident was over,and the court sessions inside the jail were back in session.
i dont know what it is about the "trunking system" but when they tried it here in the foothills,and on up into the higher sierra nevada's...it didnt seem to work,and they all went back to regular frequencies..but just below us,almost everything is trunked except the fire/ems