Randolph County (AR)
From The RadioReference Wiki
Randolph County Sheriff has the ability to go full encryption on all of their frequencies.
Sheriff: Primary 911 [Ch 1] (NXDN) WPJC500: 155.19750 (Encryption capable but rarely used) Sheriff 2: Secondary [Ch 2 ] WNDL334: 158.73000 (Encryption in use part time) Sheriff: Car-to-Car [Ch 3] WNDL334: 154.86000 (Encryption almost full time)