I am trying to find out if the NCHP us any type of special identifiers when they transmit on their frequencies. For example, in NJ the State police identify their units with the Troopers badge numbers. Since they do not re-use badge numbers, it works out well when they change rank or position. Another example would be how NJ counties do it. Each town within the county is given an identifier. The identifier is followed by the car number (Bordentown is 60, therefore the units would be 60-01, 60-02, ......... Or does the HP merely use the unit number on the license plate? This is for a book that I am writing and I am trying to be as accurate as possible. Thanks for any help you can provide.