Back on Track
Boy,
Did this every get WAY off of the original posters question.
First off, what I am saying applies to Westchester County, NY ONLY and I don't want to get into arguments that the Dog Cathcer in Upper Slobovia is a Peace Officer, etc. etc. etc.
The WCDPS is the parent organization of the COUNTY POLICE which is a full time, paid, sworn police department with Primary juristdiction on County Property and Roads and/or State Roads under contract with the county such as the Saw Mill Pkwy. It was formed from the merger of the Parkway Police, County Sheriff and County Police departments.
The PSEF is a volunteer, unpaid auxiliary police force with Peace Officer authority ONLY when on duty. They actually DO NOT perform ANY traditional Sheriff's Department functions, but rather serve as Auxiliary police to any municipality within the county upon request. They actually generally (but not always) do not provide auxiliary support to the County Police themselves. They are called Sheriff's deputies only becuase it is the Commisoner/Sheriff who grants them their authority.
So as to what radio frequencies they use. I know they have their own radios, but since they are not a primary patrol force and do not respond to calls or dispatches, they are rarely used. If they should find themselves involved in some real police work (come up on scene of accident, etc.) they will simply come up on the county or county back-up frequency using their car number.
Interestingly enough. Historically one of the big responsibilites of Sheriff was maintaining the jails. Westchester has a whole seperate department for this with its own commisioner (Department of Corrections) seperate from the DPS.
OK, Now we can continue our discussion of Peace vs. Police vs. Special Police vs. Contable vs. Sheriff vs. Ranger vs. Dog Cather, etc. etc. etc.