So the thing about this is that you have to make sure you region.xml as well as your CustomRegions.xml match with everything you have and correlate with the other xml files. YOU NEED TO BE ABSOLUTELY MATICULOUS in the code. Make sure there's no spaces, extra letters or ANYTHING that doesn't belong. Do all edits in OpenIV when possible.
I use Jurisdiction+ & have the following Agencies with their own Cars that ambiently spawn in the zones I assigned each agency & most have their own EUP or some can be installed or intergrated.
Below Is a list of Agencies I have in my LSPDFR that patrol ambiently & respond to backup.
CITY & COUNTY OF LOS SANTOS AGENCIES / DEPARTMENTS / DIVISONS
Los Santos County Sheriffs Office
LSPD
LSPD PORT POLICE
LSPD AIRPORT POLICE
LSPD METRO
Rockford Hills Police
University of San Andreas - LS - Police Department
Del Perro Police Department
Vespucci Beach Police Department
Vinewood Police Department
La Mesa Police Department
BLAINE COUNTY & MUNICIPALITIES
Blaine County Sheriffs Office
Grand Senora Police Department (Sandy Shores - Harmony - Stab City) Areas
Grapeseed Police Department
Paleto Bay Police Department
STATEWIDE AGENCIES
SAN ANDREAS STATE POLICE (Spawns lightly in All Jurisdictions - Spawns Heavily near & on Highways)
-Gang Unit (Patrols All Highways & City Zones)
US National Park Service - Federal Law Enforcement (Spawns lightly in City & County areas with Parks & Spawns Heavily in All Wilderness Zones)