Polk County (IA)
From The RadioReference Wiki
Des Moines Police Signal 8 is either "out at the station" or "jail"
DMPD Used 10 Codes
10-8 Unit In Service
DMPD Units
100 Series - First Shift 200 Series - Second Shift 300 Series - Third Shift MC - Mobile Crisis AR - Animal Control (Animal Rescue League)
Misc.
iMobile - In car mobile computer (not in all squad cars)