You might want to try 155.430 MHz., but the last time I talked with a deputy sheriff from that county, they were in the process of ripping out all of their VHF equipment in the dispatch center and going up to the MPSCS TRS. However, the patrol cars may have the following still in use, but this is not confirmed:
155.4150 Intercounty
155.3700 Point-to-Point
155.8650 M.E.P.S.S.
73's
Ron