I listen to PCSD BCI (483.4 NAC205) as they are rather active, 24-7. Does anybody have, or know, the codes that the Bureau of Criminal Investigations (BCI) dispatch calls out to patrol vehicles?
Keep in mind that for the most part sheriff's departments in MA don't do patrol as they do in other parts of the country. They run the County Jail, House of Correction, transport prisoners to and from court, and in the case of Plymouth County provide crime scene service to city and town departments.