Arizona DPS (Highway Patrol):
460.4000 (100.0 Hz) District 4 La Paz and Yuma County's
460.4750 (100.0 Hz) District 1 South, Mohave County (Outside the Arizona Strip, where I-15 runs)
460.2250 (100.0 Hz) Statewide
460.2250 (151.4 Hz) State Tac
460.2750 (100.0 Hz & 151.4 Hz) CID 1 & 3
460.5000 (100.0 Hz & 151.4 Hz) CID 2 & 4
Most of La Paz County is at least partially encrypted on the AZWINS trunked system, both at the county and municipal levels. I don't know how much of the conventional VHF-High and UHF is still in use. Here's the overall county page:
Scanner Frequencies and Radio Frequency Reference for La Paz County, Arizona (AZ)
www.radioreference.com
Here's the AZWINS page. This is the state trunked system.
Arizona Wireless Integrated Network System (AZ WINS) Trunking System Profile
www.radioreference.com
Use the Cunningham, Guadalupe Mountain, and Parker Mountain sites in La Paz County, and the Black Metal Mountain site in San Bernardino County.
ADOT Enforcement and Compliance Division officers are stationed at the port of entry, they can be listened to. They can also do mobile patrols. You should try 154.9050 (100.0 Hz) and 156.1200 (100.0 Hz) for them as well. I'm not sure how much either channel may still be in use outside of the AZWINS coverage areas. AZWINS is their main radio system, but it doesn't cover the entire state yet, like Mohave County.
DPS may simulcast D-4 UHF onto AZWINS.
Here's the Mohave County page. I am not familiar with what can and can't be heard in Mohave County.
Scanner Frequencies and Radio Frequency Reference for Mohave County, Arizona (AZ)
www.radioreference.com
John
Peoria