Sheriff, EMS and Fire have been working on Viper for quite some time now...Listen to em everyday although they are still on Vhf also....As I recall the only 800 Mhz trunking system is the following:
Alcoa Badin Works & the State Viper Tower
Stanly Co. EMS has been working some off of Viper.
I haven't heard any of the fire departments.
Law enforcement may be using their Viper Talkgroup